Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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indefinite article either of the articles "a" or "an" in English grammar. These articles do not restrict the noun to a particular person, place or thing. In the sentence, "A dog ran into my yard," the indefinite article "a" is used to show that it could have been any dog, and that a particular dog is not being named.
indefinite pronoun in grammar, a pronoun, such as "someone," that does not specifically identify its referent.