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=Traditional English pronunciation of Latin= The traditional English pronunciation of Latin is the mode in which the Latin language was traditionally pronounced by speakers of English until the early 20th century.

Since the Middle Ages, speakers of English (from Middle English onward) pronounced Latin not as the Romans did, but according to a traditional scheme borrowed from France. This traditional pronunciation became closely linked to the pronunciation of English, and as the pronunciation of English changed with time, the pronunciation of Latin changed as well.

At the end of the 19th century, this Anglo-Latin pronunciation began to be superseded by a revised Classical pronunciation, closer to an earlier Roman pronunciation, and with a more transparent relationship between spelling and pronunciation. By the mid-20th century, the traditional pronunciation had all but ceased to be used in Latin instruction. The traditional pronunciation, however, still survives in several specialized fields:
 * In a number of historical terms and names, particularly those associated with Roman culture and politics: augur, bacchanal, consul, fibula, lictor, prætor, toga, Augustus, Cæsar, Cicero, etc.
 * In words and names from classical mythology: Achilles, Argus, Calliope, Gorgon, Myrmidon, Sphinx, etc.
 * In certain sporting terms: gymnasium, stadium, discus, pentathlon
 * In some religious terms: angelus, basilica, Magi, martyr, presbyter, etc.
 * In general academic vocabulary: campus, syllabus, curriculum, diploma, alumnus
 * In specialized anatomical vocabulary: aorta, biceps, cranium, patella, sinus, vertebra, etc.
 * In medical terminology describing diseases, symptoms and treatments: anæsthesia, bacterium, coma, diarrhœa, lumbago, mucus, nausea, ophthalmia, rabies, tetanus, virus, rigor mortis etc.
 * In the taxonomic nomenclature of botany and zoology: phylum, genus, species, chrysanthemum, hibiscus, rhododendron, fœtus, larva, ovum, pupa, chamæleon, lemur, platypus
 * In astronomical nomenclature, including the names of planets, moons, asteroids, stars and constellations, such as Mars, Io, Ceres, Sirius, Ursa Major, nova, nebula.
 * In legal terminology and phrases: alibi, alias, de jure, obiter dictum, sub judice, subpœna etc. In many cases Classical pronunciation is used, however.
 * In the specialized terminology of literary studies: codex, colophon, epitome, index, periphrasis, parenthesis, etc.
 * In some mathematical terms: calculus, parabola, hyperbola, isosceles, rhombus, vector, etc.
 * In a very large body of words used everyday: album, apex, area, asylum, axis, basis, bonus, camera, census, circus, dilemma, error, focus, genius, icon, insignia, junior, major, medium, murmur, onus, panacea, podium, sector, stamina, terminus, trivia; as well as such common phrases as et cetera, non sequitur, quid pro quo, status quo, vice versa, etc.

Alphabet
Anglo-Latin (hereafter A-L) includes all of the letters of the English alphabet except w, viz.: a b c d e f g h i j k l m n o p q r s t u v x y z. It differs from Classical Latin in distinguishing i from j and u from v. In addition to these letters the digraphs æ and œ may also be used (as in Cæsar and phœnix). These two digraphs respectively represent mergers of the letters ae and oe and are often written that way (e.g. Caesar, phoenix). However, since both ae and oe represent a simple vowel, not a diphthong, in A-L, the use of the single letters æ and œ better represents the reality of A-L pronunciation. Despite being written with two letters, the sequences ch, ph, rh, th represent single sounds. The letter x, on the other hand, usually behaves like a sequence of two sounds (being equivalent to cs).

Conversion of Greek to Latin
A-L includes a large amount of Greek vocabulary; in principle, any Greek noun or adjective can be converted into an A-L word. There is a conventional set of equivalents between the letters of the Greek and Roman alphabets, which differs in some respects from the current mode of Romanizing Greek. This is laid out in the tables below:

Rh is used for Greek ρ at the beginnings of words, e.g. ρομβος (rombos) > rhombus. Rarely (and mostly in words relatively recently adapted from Greek), k is used to represent Greek κ. In such cases it is always pronounced [ k ] and never [ s ] (as it might be if spelled c) : e.g. σκελετον skeleton, not "sceleton".

Greek accent marks and breath marks, other than the "rough breathing" (first in the list of consonants above), are entirely disregarded; the Greek pitch accent is superseded by a Latin stress accent, which will be described below.

Frequently, but not universally, certain Greek nominative endings are changed to Latin ones which cannot be predicted from the tables above. Occasionally forms with both endings are found in A-L, for instance Latinized hyperbola next to Greek hyperbole. The most usual equations are found below:

Examples:
 * Greek αγγελος (aggelos) > Latin angelus (γγ > ng, -ος > us)
 * Greek ελλειψις (elleipsis) > Latin ellipsis (ει > i, ψ > ps)
 * Greek μουσαιον (mousaion) > Latin musæum (ου > u, αι > æ, -ον > um)
 * Greek μαιανδρος (maiandros) > Latin mæander (αι > æ, -ρος > er)
 * Greek χρυσανθεμον (chrusanthemon) > Latin chrysanthemum (χ > ch, υ > y, θ > th, -ον > um)
 * Greek διαρροια (diarroia) > Latin diarrhœa (ρρ > rrh, οι > œ)

Letters and sounds

 * The letters b, f, k, l, m, p, v and z have each only one sound, which corresponds to the equivalent IPA symbols.
 * The letter j has the single sound.
 * The letter r has a single sound, in rhotic dialects of English.  In non-rhotic dialects, it varies according to placement in a syllable.  At the beginning of a syllable, it is pronounced .  At the end of a syllable, i.e. between a vowel and a consonant, or after a vowel at the end of a word, it is dropped -- though not without, frequently, affecting the pronunciation of the previous vowel sound. If r occurs at the end of a word after a vowel, and the next word begins with a vowel, it is usually pronounced as the beginning of the first syllable of the next word.   Rh and rrh are pronounced exactly like r and rr.
 * When followed by a vowel, the combinations qu (always) and gu and su (usually) stand for [ kw ], [ gw ], and [ sw ] respectively.
 * The combination ph is pronounced [ f ].
 * The combination th is pronounced.
 * The combination ch is pronounced [ k ] in all environments.
 * The letters c, d, g, h, n, s, t, x have different values depending upon surrounding sounds and syllable structure.

Phonemes
The underlying consonantal phonemes of A-L are close in most respects to those of Latin, the primary difference being that / w / and / j / are replaced in A-L by / v / v and j. The sounds th and / x / ch were borrowed from Greek; the latter became an invariable [ k ] subsequent to the split of original / k / c into [ k ] and [ s ].

Greek consonant clusters
Several word-initial clusters, almost all derived from Greek, are simplified in A-L by omitting the first consonant:
 * βδ bd becomes [ d ]: bdellium
 * τμ tm becomes [ m ]: tmesis
 * κν cn, γν gn, μν mn and πν pn become [ n ]: Cnossus, gnosis, Mnemosyne, pneumonia
 * ψ ps becomes [ s ]: psyche
 * κτ ct and πτ pt become [ t ]: Ctesiphon, ptosis
 * χθ chth and φθ phth become : Chthon, phthisis
 * ξ   x becomes [ z ]: Xanthippe

In the middle of words both consonants in these clusters are pronounced (e.g. Charybdis, Patmos, Procne, prognosis, amnesia, apnœa, synopsis, cactus, captor); medial chth and phth are pronounced and  respectively, as in autochthon and naphtha.

Latin allophony
The letters c, d, g, h, n, s, t and x have different sounds (allophones) depending upon their environment: these are listed summarily below.

When allophones are included the full set of consonantal phones for A-L is almost identical to that of English, lacking only.

Miscellaneous environments
The environments which condition the appearance of some of these allophones are listed below:

The change of intervocalic / s / to [ z ] is common but not universal. Voicing is more common in Latin than in Greek words, and never occurs in the common Greek ending -sis, where s is always voiceless: basis, crisis, genesis.

Palatalization
The most common type of change giving rise to allophones in A-L is palatalization. A-L reflects the results of no less than four palatalization processes. The first of these occurred in Late Latin, the second in Proto-Gallo-Romance, the third and fourth within the history of English. While the first two palatalizations are universally used in variants of A-L, the third and especially the fourth are incompletely observed in different varieties of A-L, leading to some variant pronunciations.
 * Palatalization 1 affected only the sound of t, converting it to [ ts ] when it preceded a semivowel i (at that stage pronounced [ j ]) and did not follow s, t, or x. This [ ts ] sound eventually changed to [ s ] and was subject to further changes in Palatalization 3.  When [ t ] followed [ s ] or [ t ] it did not change; in some cases it might later change to  by Palatalization 4.  Note that t did not change to [ s ] before semivowel e, but remained [ t ] as in  confiteor.
 * Palatalization 2 affected the sounds of c and g, converting them to [ ts ] and ; the [ ts ] arising from c merged with the [ ts ] arising from t, and both shared further developments of this sound, turning to [ s ].  When geminate (double), palatalized cc and gg were affected diversely; only the second c in cc was palatalized, producing the sound [ ks ], as in successor; but both gs in gg were palatalized, producing a  sound, as in "exaggerate".
 * Palatalization 3 affected [ s ] and [ z ] of whatever origin, changing them to and.
 * Palatalization 4 affected [ s ] and [ z ] exactly as Palatalization 3 did, but also affected [ t ] and [ d ], changing them to and

Some of the occasions on which palatalizations 3 and 4 fail to take effect should be noted:
 * Palatalization 3 fails: asphyxia, Cassiopeia, dyspepsia, excelsior, exeunt, gymnasium, symposium, trapezium. Note that the semivowel i is always pronounced as a full vowel [ i ] in these cases.  In some dialects Palatalization 3 frequently fails when another  sound follows, as in "enunciation", "pronunciation", "appreciation", "glaciation", "association", with the [ s ] sound then generalized to closely related forms ("enunciate", "appreciate", "associate").
 * Palatalization 4 fails (in some dialects): cæsura, fistula, pæninsula, pendulum.

Summary

See further the section on the "semivowel" below.

Degemination
Following all of the above sound changes except palatalizations 3 and 4, "geminate" sequences of two identical sounds (often but not always double letters) were degeminated, or simplified to a single sound. That is, bb, dd, ff, ll, mm, nn, pp, rr, ss, tt became pronounced [ b d f l m n p ɹ s t ]. However, for the purposes of determining whether a syllable is open or closed, these single consonants continue to act as consonant clusters.

Other notable instances involving degemination include:


 * cc developed two pronunciations:
 * before a front vowel (e, æ, œ, i, y) cc is pronounced [ ks ], and as it consists of two distinct sounds, is not degeminated.
 * before a back vowel (a, o, u) cc was pronounced [ kk ] which degeminated to simply [ k ]
 * cqu [ kkw] degeminated to [ kw ]
 * gg also has two pronounciations:
 * before a front vowel, gg is pronounced [ dʒ ] after degemination.
 * before a back vowel, gg is pronounced [ g ] after degemination.
 * sc before a front vowel was pronounced [ ss ], and degeminated to [ s ].
 * sc and ss before the "semivowel" are pronounced [ ʃ ]

The following combinations, derived from Greek, are also pronounced as single consonants:
 * κχ cch is pronounced [ k ]: Bacchus
 * πφ pph is pronounced [ f ]: Sappho
 * τθ tth is pronounced : Pittheus

Syllables
The simple vowels of A-L (a, æ, e, ei, i, o, œ, u, y) can each have several phonetic values dependent upon their stress, position in the word, and syllable structure. Knowing which value to use requires an explanation of two syllabic characteristics, openness and stress.

Openness
Openness is a quality of syllables, which may be either open, semi-open, semi-closed, or fully closed.

Fully closed syllables
Fully closed syllables are those in which the vowel in the middle of the syllable (the vocalic nucleus) is followed by at least one consonant, which ends or "closes" the syllable. Vowels in fully closed syllables appear:
 * At the end of a word followed by at least one consonant, e.g. plus, crux, lynx.
 * In the middle of a word followed by two or more consonants. The first of these consonants "closes" the syllable, and the second begins the following syllable; thus a word like lector consists of the two closed syllables lec and tor.  Sequences of three or more consonants may be broken up in different ways (e.g. sanc.tum, sculp.tor, ul.tra, ful.crum, ex.tra) but nothing depends upon the exact way in which this is done; any sequence of three or more consonants creates a closed syllable before it.  The letter x is equivalent to cs, and as such also closes a syllable; a word like nexus is syllabified nec.sus, and consists of two closed syllables.
 * Two successive consonants of identical pronunciation are always pronounced as a single consonant in A-L. When such a consonant sequence follows a penult syllable, the syllable counts as closed for the purposes of determining the position of stress: ba.cíl.lus, di.lém.ma, an.tén.na, co.lós.sus; they also prevent a penult syllable from lengthening, as in the previous examples and also pal.lor, com.ma, man.na, cir.rus, cas.si.a, pas.sim, glot.tis.  They also count as closed for the purpose of determining whether a u is open or closed. In these respects they act precisely like syllable-closing consonant sequences, although they are pronounced as single sounds. (In words like successor the two c's do not merge, because each of them has a different sound -- [ k ] and [ s ], respectively.)
 * Certain sequences of consonants do not close syllables: these include all instances of obstruents (stops and fricatives) followed by r, including br, cr, chr, dr, gr, pr, tr, thr. Thus words like supra and matrix are syllabified as su.pra and ma.trix, and the first syllable of both words is open; likewise a.cro.po.lis, di.plo.ma, de.tri.tus.  The sequence [kw] (spelled qu) also does not close the preceding syllable; i.e., one syllabifies re.qui.em and not req.ui.em.
 * Sequences of obstruents followed by l are less consistent. The sequences cl, chl, gl and pl do not close a syllable, e.g. nu.cle.us, du.plex with open first syllables; but the sequences bl, tl, thl do close a syllable, producing the syllabifications Pub.li.us, at.las, pen.tath.lon, with closed syllables before the l.

Semi-closed syllables
Semi-closed syllables are formerly closed, unstressed syllables that became open due to the merger of two following consonants of the same sound. For the purpose of determining vowel reduction in initial unstressed syllables they count as open.
 * Double consonants following an initial syllable containing a, e, i, o merge to count as one consonant: a.(c)cumulator, a.(g)gres.sor, ca.(l)li.o.pe,  a.(p)pen.dix, e.(l)lip.sis, co.(l)lec.tor, o.(p)pres.sor, o.(p)pro.bri.um. The first syllables of all these words are only partially closed, and the vowels are reduced.
 * The same phenomenon occurs after u, but note that the u is both closed and reduced: su.(p)pres.sor, su.(c)ces.sor, cu.(r)ri.cu.lum.

Semi-open syllables
Semi-open syllables are formerly closed, unstressed syllables which are followed by a sequence of consonants that can stand at the beginning of a syllable. Since instances of obstruents+r or l are already considered open, semi-open syllables are practically restricted to instances of s+obstruent, bl, and in some cases perhaps tl. Vowels in initial semi-open syllables may be treated as open for all purposes except for determining the value of u, which is still closed in semi-open syllables.
 * When s is followed by a consonant, s syllabifies with the following consonant: a.spa.ra.gus, pro.spec.tus, na.stur.ti.um, a.sphyc.si.a (asphyxia). S also syllabifies with a following palatalized c (pronounced [ s ]):  a.sce.sis, pro.sce.ni.um. When s syllabifies with a following consonant, the preceding syllable counts as semi-open.  Possible exceptions are pos.te.ri.or, tes.ta.tor.
 * Other sequences of consonants fully close an initial unstressed syllable and produce a short vowel: an.ten.na, am.ne.si.a, bac.te.ri.um, mag.ni.fi.cat, mac.sil.la (maxilla), spec.ta.tor, per.so.na, oph.thal.mi.a, tor.pe.do.

See further the section on initial unstressed syllables below.

Open syllables
Open syllables are those in which the nucleus is followed:
 * By no consonant at the end of the word: pro, qua.
 * By a vowel in the middle of a word : oph.thal.mi.a, fi.at, cor.ne.a, cha.os, chi.as.mus, a.ma.nu.en.sis.
 * By only a single consonant in the middle of a word: sta.men, æ.ther, hy.phen, phœ.nix, ter.mi.nus, a.pos.tro.phe.
 * By those consonant clusters which do not fully or partially close a syllable In the middle of a word :  ma.cron, du.plex, Cy.clops, tes.ta.trix, a.cro.po.lis.

Stress
Primary stress

Stress is another characteristic of syllables. In A-L, it is marked by greater tension, higher pitch, lengthening of vowel, and (in certain cases) changes in vowel quality. Its exact concomitants in Classical Latin are uncertain. In Classical Latin the main, or primary stress is predictable, with a few exceptions, based on the following criteria: Primary stress can therefore be determined in cases where the penult is either closed or contains a diphthong. When it contains a vowel that may have been either short or long in Classical Latin, stress is ambiguous. Since A-L does not distinguish short from long vowels, stress becomes a lexical property of certain words and affixes. The fact that decorum is stressed on the penult, and exodus on the antepenult, is a fact about each of these words that must be memorized separately (unless one is already familiar with the Classical quantities).
 * In words of one syllable, stress falls on that syllable, as marked in the following syllables with an acute accent: quá, nón, pár.
 * In words of two syllables, stress falls on the first syllable of the word (the penult, or second from the end): e.g. bó.nus, cír.cus.
 * In words of three or more syllables, stress falls either on the penult or the antepenult (third from the end), according to these criteria:
 * If the penult contains a short vowel in an open syllable, the stress falls on the antepenult: e.g. stá.mi.na, hy.pó.the.sis.
 * If the penult contains a long vowel; a diphthong; a closed syllable (with any length of vowel); or is followed by z, the stress falls on the penult.
 * Long vowel: cicāda > cicáda, exegēsis > exegésis.
 * Diphthong: musáeum, amóeba, Acháia, paranóia, thesáurus
 * Closed syllable: aórta, interrégnum, prospéctus, rotúnda
 * z: ''horízon

Secondary stress

Secondary stress is dependent upon the placement of the primary stress. It only appears in words of four or more syllables. There may be more than one secondary stress in a word; however, stressed syllables may not be adjacent to each other, so there is always at least one unstressed syllable between the secondary and primary stress. Syllables containing semivowel e or i are never stressed.
 * If a 4-syllable word has primary stress on the antepenult, there is no secondary stress: pa.rá.bo.la, me.tá.the.sis.
 * If a 4-syllable word has primary stress on the penult, secondary stress is on the first syllable, marked hereafter with a grave accent: à.la.bás.ter, è.pi.dér.mis, sì.mu.lá.crum, prò.pa.gán.da, ùl.ti.má.tum.
 * If a 5-syllable word has primary stress on the antepenult, secondary stress is on the first syllable: hìp.po.pó.ta.mus, Sà.git.tá.ri.us, Phì.la.dél.phi.a.

Secondary stress in words with three or more syllables before the primary stress is less predictable. Such words include those of five syllables with penult primary stress, and all words of six syllables in length or longer. The following generalizations about such long words may be made:
 * The syllable immediately before the primary stress is never stressed.
 * Words produced by derivation from a shorter word convert the primary (and, if any, secondary) stress of the stem into a secondary stress, as long as it does not fall immediately before the new primary stress: é.le.phant- + í.a.sis becomes è.le.phan.tí.a.sis
 * Compounds of which the compound element consists of more than one syllable likewise convert the primary stress of their elements into secondary stress: phár.ma.co- + póei.a becomes phàr.ma.co.póei.a.
 * If a primary stress is eliminated in compounding or derivation because it would stand next to another stress, secondary stress remains unchanged: pùsillánimus + itas becomes pùsillanímitas.
 * Single-syllable prefixes and single-syllable compound-elements are generally unstressed: ac.cù.mu.lá.tor, im.pè.di.mén.ta, Her.mà.phro.dí.tus
 * In other cases where the composition of the word may be unclear, every other syllable before the primary stress is stressed: a.mà.nu.én.sis, ò.no.mà.to.póei.a.

Unstress

Unstressed syllables are all others. They are always adjacent to a stressed syllable; that is, there can never be more than two unstressed syllables in a row, and that only when the first one follows a stressed syllable.

Semivowel
Several sound-changes in A-L are due to the presence of the "semivowel", an alteration of certain front vowels. Originally ordinary vowels, they acquired at different points in history the value of the glide [ j ] (a y-sound like that in English canyon). Subsequently, their value has fluctuated through history between a consonant and a vowel; the term "semivowel" thus reflects the intermediate historical as well as phonetic position of this sound. The environment in which the semivowel was produced was as follows:


 * 1) The vowel was e (æ, œ), i (ei), or y.
 * 2) The vowel came immediately before a vowel or diphthong.
 * 3) The vowel was not in the initial syllable: e, æ, ei, i and y in rhea, mæander, meiosis, fiat, diaspora, hyæna,  did not become semivowels.
 * 4) The vowel was unstressed: e, æ, œ, ei, i in idea, Piræus, diarrhœa, Cassiopeia, calliope, elephantiasis did not become semivowels.

Examples of words where e, i, y became semivowels include: miscellanea, chamæleon, nausea, geranium, rabies, Aries, acacia, ratio, fascia, inertia, halcyon, polyanthus, semiosis, mediator, Æthiopia, Ecclesiastes.

The effects of the semivowel include the following:
 * 1) Though always in hiatus with a following vowel, semivowel i and y are never pronounced like long i or y (e.g. American English ); historically semivowel e could also be distinguished from "long e" (formerly  or ). In current varieties of A-L, semivowels are pronounced in a variety of ways:
 * 2) * Most frequently as [ i ]: labia, radius, azalea, præmium, cornea, opium, Philadelphia, requiem, area, excelsior, symposium, Cynthia, trivia, trapezium. In British Received Pronunciation, the prescribed pronunciation was.
 * 3) * In some dialects or registers of English as [ j ], e.g. junior pronounced.
 * 4) * Merged with a following -es or -e ending, as in Aries, scabies .
 * 5) * They are usually deleted following the palatals, and : Patricia, consortium, Persia, nausea, ambrosia, Belgium.
 * 6) *Occasionally a semivowel is retained after a palatal sound: ratio, sometimes Elysium. This type of pronunciation is an artificiality, as the sounds  and  resulted from an absorption of the original [ j ] in the sequences [ sj ], [ zj ].  The pronunciations with  and  result from a re-introduction of the i sound to conform with the spelling.  This pronunciation was, however, recommended by academics, and as such is common in the pronunciation of A-L phrases such as ab initio, in absentia, venire facias.
 * 7) The consonant t changed to [ s ] and then to  before the semivowel arising from i: minutia, inertia, nasturtium.
 * 8) The sibilants [ s ] (including ss, sc, c, and t)  and [ z ] (usually spelled s)  are usually palatalized before the semivowel:
 * 9) * [ s ] > : cassia, fascia, species, militia
 * 10) * [ z ] > : amnesia, ambrosia
 * 11) The vowels a, e, æ, and o in a open antepenult syllable become long if a semivowel appears in the next syllable:
 * 12) * radius, Asia, azalea,area
 * 13) * anæmia, chamæleon
 * 14) * genius, medium, interior
 * 15) * odium, cochlea, victoria
 * This lengthening takes place regularly in antepenultimate syllables. It is less regular in syllables further back.  On the one hand, there are words which do seem to show lengthening before a semivowel in the next syllable:
 * Æthiopia, Ecclesiastes, mediator, negotiator, variorum.
 * On the other hand, some words have short vowels:
 * gladiator, apotheosis, Meleagrus, polyanthus (and other words containing poly- followed by a vowel).
 * In general, those words which have lengthened vowels in pre-antepenult syllables before a semivowel in the next syllable are those which are derived from a word with a regularly lengthened vowel in an antepenult syllable, e.g.: Æthiopia from Æthiops ("Ethiopian"), Ecclesiastes from ecclesia ("church"), mediator from medium, negotiator from negotium ("business'), variorum from varius ("manifold"). The failure of gladiator (from gladius, "sword") to have a long vowel is anomalous.

Mergers
The most notable distinction between A-L and other varieties of Latin is in the treatment of the vowels. In A-L, all original distinctions between long and short vowels have been obliterated; there is no distinction between the treatment of a and ā, etc., for instance. However, the subsequent development of the vowels depended to a large degree upon Latin word stress (which was preserved nearly unchanged in the mediæval period), and as this was in part dependent upon vowel length, in certain cases Latin vowel length contrasts have been preserved as contrasts in both stress and quality. However, the immediate governing factor is not length but stress; short vowels which were stressed for various reasons are treated exactly like stressed long vowels.

In addition to the merger of long and short vowels, other vowel mergers took place:
 * the diphthongs æ and œ merged with e
 * the vowels i and y merged
 * the diphthong ei (also æi, œi), when still written distinctively, in pronunciation was merged with i or (more frequently) e

The merger of æ and œ with e was commonly recognized in writing. Sometimes forms written with æ and œ coexist with forms with e; in other cases the form with e has superseded the diphthong in A-L. Consider the following: The following words are usually spelled with e, though they originally had æ:
 * æon and eon, æther and ether, amœba and ameba, anæmia and anemia,  anæsthesia and anesthesia, cæsura and cesura, chamæleon and chameleon, dæmon and demon, diæresis and dieresis, encyclopædia and encyclopedia,  fæces and feces, fœtus and fetus, hyæna and hyena, prætor and pretor
 * ænigma > enigma, æquilibrium > equilibrium, æra > era, Æthiopia > Ethiopia, diarrhœa > diarrhea, mæander > meander, musæum > museum, œsophagus > esophagus, pæninsula > peninsula, præcentor > precentor, prædecessor > predecessor, præmium > premium, præsidium > presidium, tædium > tedium

In other cases, particularly names, the forms with the diphthongs are the only correct spelling, e.g. ægis, Cæsar, Crœsus, Œdipus, onomatopœia, pharmacopœia, Phœbe, phœnix, Piræus, sub pœna.

The sequences ei, æi, œi (distinguished in writing and pronunciation from ej, the vowel followed by a consonant, as in Sejanus) are sometimes retained in spelling preceding a vowel. In such cases the sequence is invariably pronounced as a simple vowel, sometimes i (as in meiosis, pronounced as if miosis) but more usually e: Cassiopeia, Deianira, Pleiades, onomatopœia, pronounced as if Cassiopea, Deanira, Pleades, onomatopea.

The result was a system of five vowels, a, e, i, o, u. These would subsequently split, according to their environment, into long, short, and (eventually) unstressed variants; and these variants would eventually also be altered in various dialects of A-L dependent upon neighboring sounds. However, in phonemic terms, A-L still has only five vowels, with multiple allophones.

In addition, there were the diphthongs, ai, oi, ui, au and eu. Of these, ai and au eventually monophthongized, eu merged with the open variant of u, and yi merged with the "long" i. Only oi and ui remained as true diphthongs, but both are extremely rare.

Allophones of a, e, i and o
The vowels a, e, i, o have three primary variations: long, short, and reduced; each of these may, in turn, have additional variations based on their phonetic environment, including whether they are stressed; in an open or closed syllable; their position in the word; and neighboring consonants. One of the most common environmental alterations of a vowel is due to the presence of a following r; such vowels will be called "r-colored".

Short vowels
This is the default value for vowels, observed:
 * 1) In closed monosyllables.
 * 2) In stressed closed penult syllables.
 * 3) In all antepenult syllables, open or closed, which receive primary stress, except for those lengthened due to a following semivowel.
 * 4) In all syllables with secondary stress.
 * 5) In fully closed unstressed syllables which immediately precede, but do not follow, a primary or secondary stress (usually in the first syllable of a word). Exceptions are made for certain prefixes.

All short vowels have variants colored by a following r sound when the r is followed by a different consonant (not r) or by the end of the word. In addition, there is a variant of short a which only appears after a [ w ] sound – chiefly found in the sound qu [ kw ].

Exceptionally, monosyllables ending in es are pronounced with the rhyme [ iz ], e.g. pes, res. This pronunciation is borrowed from that of -es used as an ending.

Exceptions to the pronunciation of short y generally involve prefixed elements beginning with hy- in an open syllable, such as hydro- and hypo-; these are always pronounced with a long y, e.g. hydrophobia, hypochondria. This pronunciation is the result of hypercorrection; formerly they were pronounced with a short, as is still the case in the word "hypocrite" and (for some speakers and formerly commonly) hypochondria.

Prefixes may also behave in anomalous ways:
 * 1) The prefix ob- in unstressed syllables may be reduced to, even when it closes a syllable: cf. "obsession, oblivion".
 * 2) The Greek prefix en-, em- in a closed unstressed syllable may be reduced to : encomium, emporium.
 * 3) The prefix ex- in an unstressed syllable may be reduced to, despite always being in a closed syllable: exterior, exemplar.
 * 4) The prefix con-. com- is reduced to  when unstressed: consensus, compendium, regardless of whether the syllable is closed or not.
 * 5) The preposition and prefix post(-) is anomalously pronounced with "long o": : post-mortem and cf. "postpone"; also thus in words in which post was originally a preposition (postea, postquam) but not in other derivatives, being pronounced with short o in posterus, posterior, postremo, postridie.

Long vowels
Long vowels are those which historically were lengthened; by virtue of subsequent sound changes, most of them are now diphthongs, and none is distinguished by vowel length; however, the term "long" for these vowels is traditional. "Long" vowels appear in three types of environments:
 * 1) a, e, i and o are long in an open monosyllable.
 * 2) a, e, i and o are long in a stressed open penult syllable.
 * 3) a, e and o are long when in an open syllable followed by semivocalic i and e.
 * 4) a and o are long when they precede another vowel in hiatus; i and e are long in the same environments, but only when they are not semivocalic (i.e., when they are in the initial syllable or receive primary stress).  Hiatus may be original, or may arise from the deletion of h between a stressed and unstressed syllable.

Reduced vowels
Reduced vowels appear in unstressed syllables, except for:
 * Closed initial unstressed syllables, which are generally short.
 * Certain unstressed final syllables.

Initial unstressed syllables
A variety of possible realizations are available for open, semi-open, and semi-closed initial unstressed syllables, including (for e and i) long, short, and reduced variants. Fully closed initial unstressed syllables are always short.

The variation in the value of the initial open unstressed vowel is old. Two different types of variation can be distinguished; the older use of a "long" vowel for i, y, o (and their variants); and more recent variations in the value of the reduced vowel.

No completely general rule can be laid down for the appearance of an initial unstressed long vowel, although such vowels must have appeared before the shortening of geminate consonants, as they are restricted to fully open syllables. The most general tendency is for long vowels to appear when i and y are either preceded by no consonant or by h, e.g. idea, isosceles, hyperbola, hypothesis. The prefixes in and syn never have long vowels: inertia, synopsis. I and y also tend to be short when the next syllable contains an i or y, short or long: militia, divisor.

O is a little less likely to appear with a long value in this location; or, at any rate, it is harder to distinguish the long value from the reduced vowel.

Unstressed e and i in open syllables had merged by the early 17th century; their reduced reflex is often transcribed, but by many speakers is still pronounced as a high front lax vowel, distinct from the derived from a. For such speakers, the first syllables in Demeter and Damascus are pronounced differently. The only IPA symbol available for this sound is ; however, the sound is not identical to the short vowel, but is more central.

Unstressed o, also often transcribed, is by many speakers pronounced with considerable lip-rounding; the closest IPA symbol is.

The partially closed initial unstressed vowels began as short vowels, but were later reduced.

These are the same sounds as in the preceding chart, but without the option of the "long" vowels and much less rounding of the o.

proscenium does not fall in this group, apparently because felt to be pro+scenium.

Medial unstressed syllables
All vowels in medial unstressed syllables are reduced to, regardless of whether they are in open or closed syllables, except for those followed by r plus another consonant, which become.

Open and closed u
The pronunciation of the letter u does not depend upon stress, but rather upon whether the syllable in which it appears is open or closed. There are no "long" and "short" variants of either type of u, but there are reduced and r-colored variants of both types.

Open u
The underlying sound of open u is / ju /; it shares developments with the homophonous diphthong eu, which can however appear in closed syllables.

The sound [ j ] in / ju / and its allophones is deleted in various environments:
 * After palatal consonants, whether original or resulting from the merger of [ j ] and the preceding consonant, in both stressed and unstressed syllables; e.g. : junior, Julius, Jupiter, cæsura, educator, spatula, fistula

After the following consonants when they precede u in an initial, final, or stressed syllable:
 * and [ l ]: rumor, verruca, luna, Lucretia, Pluto, effluvium
 * [ s ], [ z ], and [ st ]: super, superior, Vesuvius, Zeus, stupor

In some dialects, particularly of American English, [ j ] is deleted after the following consonants when they precede u in an initial, final or stressed syllable:
 * [ d ], [ n ], [ t ] and : duplex, caduceus, medusa, nucleus, lanugo, tutor, Thucydides
 * For some speakers, / ju / becomes [ ɪu ] following these consonants.

[ j ] is not deleted in the following environments:
 * When u is the first letter of the word or follows [ h ]: uterus, humerus
 * Following a vowel: Ophiuchus
 * Following labials [ p b f v m ]: pupa, furor, nebula, uvula, musæum
 * Following velars [ k g ] : cumulus, lacuna, Liguria
 * When it is in an interior unstressed syllable not following a palatal consonant, [ j ] remains after a single consonant even when it might be deleted in a stressed syllable: amanuensis and cf. "cellular, granular", for some speakers "virulent".
 * After a consonant cluster [ j ] may or may not be deleted: pæninsula, cornucopia

Variants of / ju / are shown below:

Closed u
Closed u appears only in closed syllables, except for instances of the prefix sub- before a vowel. It has reduced and r-colored variants, as shown below. r-coloration only appears when the r is followed by a different consonant (not r) or the end of the word.

Diphthongs
Diphthongs in A-L are distinguished from simple vowels by having no long or short variants, regardless of position or syllable type. The only diphthongs that are at all common are au and eu. For variations in the pronunciation of the latter, see Open u. Au is, rarely, reduced in an unstressed syllable to : Augustus pronounced as if "Agustus". Such words may be pronounced with the full value of the diphthong, however.

Note that ui is often dissyllabic, as in fruc.tu.i, va.cu.i, tu.i. The words cui and huic were traditionally pronounced and  (Am., Au. ).

Phonology
Since A-L developed for many centuries within English, yet without having a full complement of English sounds, its phonology taken in isolation is somewhat unlike that of most natural languages.

For the most part, establishing the identity of A-L phonemes presents little difficulty. The r-colored vowels  are clearly conditioned by a following, and are allophones of , respectively. The reduced vowel is likewise an allophone of the same five vowels in unstressed syllables, and the reduced r-colored vowel  in American English is likewise an allophone occurring in unstressed syllables preceding.

The exact status of the "long vowels" is more difficult to ascertain. They certainly exist as conditioned alternants to the short vowels ; the limits on their distribution demonstrate that they cannot be the underlying forms. Their exact identity, given dialectal variants, is debatable, but they will here be considered to be, the last being a form of which palatalizes a preceding consonant.

However, many of these sounds can be demonstrated to exist as independent phonemes as well. is certainly a phoneme, when it appears as eu, in closed as well as open syllables. / ai / is marginally phonemic, as it exists in the closed syllable / haik / huic. / ei / is possibly phonemic when it appears as the diphthong ai, but due to the limitations of the data this cannot be demonstrated; in a maximally parsimonious system, it could be accounted for, even in these cases, merely as an allophone of. is at least marginally phonemic as it appears in the word post; and more certainly insofar as it provides a distinction between the endings -os and -ōs. The vowel [ i ] and its allophones might also be considered to be merely allophones of   ; however, their sporadic (if somewhat uncertain) appearance in initial unstressed and final syllables suggests a basis for considering them phonemic. The creation of apparent minimal pairs due to degemination (e.g. penna vs. pœna, collum  vs. colum ) could also be used to make a case for the existence of / i / and  as independent phonemes.

In addition, the vowel and the diphthongs  and  are unquestionably phonemic in A-L.

The table below reflects an analysis of A-L phonemes in which each of the "long vowels" has phonemic status.

Endings
The pronunciation of the final syllables of polysyllabic words do not always correspond to what might be expected from the constituent phonemes. Some endings also have more than one pronunciation, depending upon the degree of stress given to the ending.

Three types of endings can be distinguished:

Vowel alone
The first class consists of vowels alone, i.e. -a, -e, -æ, -i, -o, -u, -y. In this class, the vowels are generally long, but -a is always. In British Received Pronunciation, -e and -æ are  (but in many other varieties of English [ i ]).

In the words mihi, tibi, sibi, by an old tradition, the final i was pronounced like final e above (i.e., as if spelled mihe, tibe, sibe).

A late and purely academic pronunciation distinguished final -ā from -a by pronouncing the former like "long a", : for instance, Oxford professor A. D. Godley rhymed "day" with Rusticā. That this was not the usual pronunciation can be told from such forms as circa, infra, extra, in absentia, sub pœna, all of which have an originally long final vowel: circā, sub pœnā, etc. This use is distinct from the older tradition (in use in the 17th-18th centuries) had made all final a's "long", regardless of their Latin length.

Vowel plus consonant cluster
The second class consists of vowels consonant clusters such as ns, nt, nx, ps, x. In this class, the vowels are always short. The vowel u may be reduced to.

Vowel plus consonant
The third class consists of vowels followed by the consonants l, m, n, r, s, t. The treatment of these endings is inconsistent. Generalizations include:
 * 1) All vowels are reduced before final r, creating American, British and Australian : Cæsar, pauper, triumvir, Mentor, sulfur, martyr.
 * 2) All vowels are reduced to  before l: ''tribunal, Babel, pugil, consul.
 * 3) Except sometimes before t, a is reduced to  before any of this class of consonant: animal, memoriam, titan, atlas.
 * 4) All instances of u are reduced to  before any of this class of consonant: consul, dictum, locus.

The remaining endings are: -at, -em, -en, -es, -et, -im, -is, -it, -on, -os, -ot. Of these, -em, -im, -is, -it, -on, -ot have two possible pronunciations, one with a short vowel and one with. Final -es and -ies are alike pronounced [ iz ]. Final -eus may be pronounced containing the diphthong eu, or as if it were semivowel e followed by the ending -us. However, even when pronounced as two syllables, -eus still counts as a single syllable for the purpose of determining vowel length; the syllable preceding the ending is considered a penult.

This last pronunciation of -os is the expected one; however, in the masculine accusative plural, where the ending is historically -ōs, the academic prescription was the pronunciation Am. , Br. , Au. . Such an ending is not, of course, commonly met in isolated vocabulary items and proper names.

Sample text
O Fortúna, velut luna, statu variabilis, semper crescis aut decrescis;

Amer:

Brit:

Aust:

vita detestabilis nunc obdúrat et tunc curat ludo mentis aciem, 

Amer:

Brit:

Aust:

egestátem, potestátem, dissolvit ut glaciem.

Amer:

Brit:

Aust:

''Ave formosissima, gemma pretiósa! Ave decus virginum, virgo gloriósa!''

Amer:

Brit:

Aust:

''Ave mundi luminar, Ave mundi rosa! Blanziflor et Helena, Venus generósa.''

Amer:

Brit:

Aust:

History
Latin as traditionally pronounced by English speakers is part of the living history of spoken Latin through medieval French into English.

Three stages of development of A-L can thus be distinguished:

Stage I
Latin from the period when its orthography and grammar became standardized through to the pronunciation changes of Late Latin, while it was still a living language. Changes that took place in this period included:
 * the merger of f and ph as [ f ]
 * the change in pronunciation of v (formerly [ w ]) to [ v ] and of j (formerly [ j ]) to.
 * the merger of i and y as [ i ]
 * the merger of e, æ and œ as [ e ]
 * the change of non-initial, unstressed, prevocalic [ i ] to [ j ]
 * the loss of distinctions of vowel length (merger of all long and short vowels)
 * the palatalization of t to [ ts ] before [ j ]

Stage II
Latin spoken in the context of Gallo-Romance and French from approximately the 6th to the 11th-12th centuries. During this period, Latin became a primarily written language, separated from the ordinary spoken language of the people. While it escaped many of the changes of pronunciation and grammar of Gallo-Romance, it did share a few of the changes of the spoken language. This was for the most part a period of stability. Changes in this period included:
 * the palatalization of c and g to [ ts ] and before front vowels
 * the voicing of intervocalic s to [ z ]
 * the fronting of u to [ y ]
 * the restoration (based on spelling) of the vowels [ i ] and [ e ] from [ j ]

Stage III
Latin spoken in the context of English from the 11th/12th centuries to the present. This last stage provides the greatest and most complicated number of changes. It starts with the displacement of the native pronunciation of Latin under the Anglo-Saxon kings with that used in the north of France, around the time of the Norman conquest in 1066. The English and French pronunciations of Latin were probably identical down to the thirteenth century, but subsequently Latin as spoken in England began to share in specifically English sound changes. Latin, thus naturalized, acquired a distinctly English sound, increasingly different from the pronunciation of Latin in France or elsewhere on the Continent.

Some phases of development in this third stage can be reconstructed:

1200-1400

 * The adaptation of the French sounds to English:
 * [ s ] was substituted for [ ts ]. (The French sound changed at about the same time, however, A-L did not share related French simplifications such as > .)
 * the vowels were given the values a, e , i , o , u [ y ]
 * was substituted for [ y ] in closed syllables
 * Stressed open penultimate vowels were lengthened, creating the short/long contrasts:
 * a, e , i , o

1400-1600

 * Merger of unstressed open with
 * Non-syllable-initial, unstressed, prevocalic became [ j ] (a change almost identical to that of Late Latin)
 * Lengthening of the first of two vowels in hiatus
 * Lengthening of e, i , or o  in pretonic initial syllables
 * Diphthongization of  to
 * Lengthening of vowels in open syllables before [ j ] in the next syllable
 * Raising of and  to  and.
 * Degemination of geminate consonants
 * Palatalization of [ s ] and [ z ] before [ j ]
 * Fronting of to

1600-1800

 * Monophthongization of ai to  and au  to
 * Change of [ j ] to  (later > [ i ]) in many words, restoring original syllabicity.
 * Change of fronted u ([ y ]) to
 * Palatalization of [ t d s z ] before (usually unstressed) (later > )
 * Loss of distinctive vowel length, creating the short/long contrasts: a, e , i , o
 * Lowering and unrounding of short, to ,
 * Former long i becomes [ ai ]
 * Fronting and raising of short a, long a [ a ], and long e [ e ] to , creating the new contrasts:  a , e , i , o
 * Beginning of vowel reductions to.

1800-Present

 * Development of [ e ] and [ o ] to diphthongs [ ei ]  and [ ou ]
 * Laxing of [ ei ] [ ou ] (variously) to,  , and the latter to
 * Continued vowel reductions to (a still current process).

Resources

 * Andrews, E. A. and S. Stoddard, 1836. Grammar of the Latin Language for the Use of Schools and Colleges. This popular Latin grammar printed toward the end of the period when Anglo-Latin pronunciation was still commonly taught in schools, devotes a section to the rules of the pronunciation. While somewhat scattershot in its approach, it reveals several otherwise inaccessible details of the traditional pronunciation.
 * Walker, John, 1798. Key to the Classical Pronunciation of Greek, Latin, and Scripture Proper Names. Although this handbook is mostly devoted to establishing the position of the accent in Classical names used in English, it also includes an essay setting out some of the rules and regularities in the Anglo-Latin pronunciation.
 * Campbell, Frederick Ransom, 1888. The Language of Medicine. Chapter II, pp. 58-64 describes the pronunciation used in late 19th-century scientific and medical Latin.
 * Robinson, D. H., revised by Hannah Oliver, 1903. The Latin Grammar of Pharmacy and Medicine. Chapter I, pp. 7-11, describe the pronunciation of pharmaceutical and medical Latin.
 * Sturmer, Julius William, 1908. Rudiments of Latin. Pp. 9-17 describe early 20th century scientific Latin pronunciation.
 * Dobson, E.J., ed., 1957. The Phonetic Writings of Robert Robinson. Includes a phonetic transcription of a Latin poem representing the English pronunciation of Latin c. 1617, the direct ancestor of the later Anglo-Latin pronunciation.
 * The Pronunciation of English Words Derived from the Latin
 * Pronunciation of Biological Latin