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Indefinite article
The indefinite article of English takes the two forms a and an. Semantically, they can be regarded as meaning "one", usually without emphasis. They can be used only with singular countable nouns; for the possible use of some (or any) as an equivalent with plural and uncountable nouns, see Use of some below.

Distinction between a and an
The form an is used before words starting with a vowel sound, regardless of whether the word begins with a vowel letter. This avoids the glottal stop (momentary silent pause) that would otherwise be required between a and a following vowel sound. Where the next word begins with a consonant sound, a is used. Examples: a box; an apple; an SSO (pronounced "es-es-oh"); a HEPA filter (HEPA is pronounced as a word rather than as letters); an hour (the h is silent); a one-armed bandit (pronounced "won..."); an heir (pronounced "air"); a unicorn (pronounced "yoo-"); an herb in American English (where the h is silent), but a herb in British English; "a unionized worker" but "an unionized particle".

Some speakers and writers use an before a word beginning with the sound in an unstressed syllable: an historical novel, an hotel. However, this usage is now less common.

Some dialects, particularly in England (such as Cockney), silence many or all initial h sounds (h-dropping), and so employ an in situations where it would not be used in the standard language, like an 'elmet (standard English: a helmet).

There used to be a distinction analogous to that between a and an for the possessive determiners my and thy, which became mine and thine before a vowel, as in mine eyes.

In other languages
Other more or less analogous cases in different languages include the Yiddish articles "a" and "an"  (used in essentially the same manner as the English ones), the Hungarian articles a and az (used the same way, except that they are definite articles; juncture loss, as described below, has occurred in that language too), and the privative a- and an- prefixes, meaning "not" or "without", in Greek and Sanskrit.

Pronunciation
Both a and an are usually pronounced with a schwa:,. However, when stressed (which is rare in ordinary speech), they are normally pronounced respectively as (to rhyme with day) and  (to rhyme with pan). See Weak and strong forms in English.

Etymology
An is the older form (related to one, cognate to German ein; etc.).

Usage
The principles for use of the indefinite article are given above under.

In addition to serving as an article, a and an are also used to express a proportional relationship, such as "a dollar a day" or "$150 an ounce" or "A sweet a day helps you work, rest and play", although historically this use of "a" and "an" does not come from the same word as the articles.

Juncture loss
In a process called juncture loss, the n has wandered back and forth between the indefinite article and words beginning with vowels over the history of the language, where for example what was once a nuncle is now an uncle. The Oxford English Dictionary gives such examples as smot hym on the hede with a nege tool from 1448 for smote him on the head with an edge tool, as well as a nox for an ox and a napple for an apple. Sometimes the change has been permanent. For example, a newt was once an ewt (earlier euft and eft), a nickname was once an eke-name, where eke means "extra" (as in eke out meaning "add to"), and in the other direction, a napron (meaning a little tablecloth, related to the word napkin) became an apron, and a naddre became an adder. The initial n in orange was also dropped through juncture loss, but this happened before the word was borrowed into English.