- an article, as English a, an, that denotes class membership of the noun it modifies without particularizing it.
Origin of indefinite article
First recorded in 1720–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- grammar a determiner that expresses nonspecificity of reference, such as a, an, or someCompare definite article
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