/ Dictionary / Index O ouster: Meaning and Definition of Find definitions for: oust•er Pronunciation: (ou'stur), [key] — n. expulsion or removal from a place or position occupied: The opposition called for the ouster of the cabinet minister. an ejection or eviction; dispossession. a wrongful exclusion from real property. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ouster (Thesaurus) oust out Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language