/ Dictionary / Index O oligo-: Meaning and Definition of Find definitions for: oligo- Pronunciation: [key] a combining form meaning “few,” “little,” used in the formation of compound words: oligopoly. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. oligarchy Oligocene Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language