/ Dictionary / Index S sufficient: Meaning and Definition of Find definitions for: suf•fi•cient Pronunciation: (su-fish'unt), [key] — adj. adequate for the purpose; enough: sufficient proof; sufficient protection. (of a condition) such that its existence leads to the occurrence of a given event or the existence of a given thing. Cf.(def. 4c). competent. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sufficient (Thesaurus) sufficiency suffix Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language