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Obviate person deixis is a grammatical person marking that distinguishes a non-salient (obviative) referent from a more salient (proximate) referent in a given discourse context. The third person proximate may sometimes be referred to as the "fourth person."

North America
Obviate/proximate distinctions are common in some indigenous language families in northern North America. Algonquian languages are perhaps best-known for obviation, but obviation also occurs in some Salishan languages, as well as in the more southern Keresan languages. Obviation in the Kutenai language, a North American language usually described as a language isolate, is notable because of the language's proposed relationships with the Salishan and Algonquian families.

Africa
Obviative markers are used in some Nilo-Saharan languages, as well as in some languages in the possibly related Niger-Congo family.

Elsewhere
Obviation has also been attested in the Northeast Caucasian Ingush language.

Cross-Linguistic Patterns

 * Where animacy is involved, animates tend to be proximate, while inanimates tend to be obviative.
 * Possessors are frequently obligatorily proximate.
 * Obviation is most common in head-marking languages since the obviative is useful in disambiguating otherwise unmarked nominals.
 * The obviative referent seems to always be the marked form, while the proximate is unmarked.
 * Obviative marking tends to apply only to the third person, though it has been attested in the second person in a handful of Nilo-Saharan languages.
 * Proximate/Obviative assignments are preserved throughout clauses and are also often constant over longer narratives.

Ojibwe
The following is a typical example of obviate/proximate morphology in the Eastern dialect of the Algonquian Ojibwe language, in which the obviative is marked on nouns and demonstratives and reflected in pronominal verb affixes:

'Then this ( prox ) young man ( prox ) dreamed ( prox ) that foreigners ( obv ) would come ( obv ) to kill ( obv ) them ( prox ).'

Note that this example shows that the proximate referent must not necessarily be the subject of a clause.

Potawatomi
The Algonquian Potawatomi language is notable for having two "degrees" of obviation. As is seen in the following example, a "further obviative" referent deemed even less salient than the obviative referent can be marked by reduplication of the obviative suffix:

Ingush
Obviation in the Ingush language, a heavily dependent-marking language, is an exception to the generalization that the obviative occurs in head-marking languages. Obviation is not overtly marked in Ingush, but is implied by the fact that certain constructions are only possible when one referent has salience over another.

For example, if a non-subject-referent has salience over the subject and precedes the other co-referent, reflexivization (normally used only when there is a coreferent to the subject) is possible. This is shown in the example below where the non-subject-referent appears to have salience over the subject: 'Musa's dog barked at him.'

If the subject is salient ("proximate"), on the other hand, the subject's possessor may not antecede the third person object, and the possession must be indirectly implicated as follows: 'Musa's wife is looking for him.' (Lit. 'The wife is looking for Musa.')