/ Dictionary / Index I indefinite article: Meaning and Definition of Find definitions for: indef'inite ar'ticle Pronunciation: [key] — Gram. Gram. an article, as English a, an, that denotes class membership of the noun it modifies without particularizing it. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. indefinite indefinite integral Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language