/ Dictionary / Index O oligarch: Meaning and Definition of Find definitions for: ol•i•garch Pronunciation: (ol'i-gärk"), [key] — n. one of the rulers in an oligarchy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: oligarch (Thesaurus) olig- oligarchic Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language