indefinite article

American  

noun

Grammar.

1. an article, as English a, an, that denotes class membership of the noun it modifies without particularizing it.

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indefinite article British  

noun

1. grammar a determiner that expresses nonspecificity of reference, such as a, an, or some Compare definite article

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indefinite article Cultural  

1. The word a or an introducing an unspecified noun or the name of a general category: “a dog,” “an apple,” “an orange.” An is used when the next word begins with a vowel or a silent (unpronounced) h, as in “an egg” or “an hour.”

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Etymology

Origin of indefinite article

First recorded in 1720–30