/ Dictionary / Index K know-all: Meaning and Definition of Find definitions for: know-all Pronunciation: (nō'ôl"), [key] — n. Informal. a know-it-all. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: know-all (Thesaurus) knowable knowe Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language