/ Dictionary / Index O obsession: Meaning and Definition of Find definitions for: ob•ses•sion Pronunciation: (ub-sesh'un), [key] — n. the domination of one's thoughts or feelings by a persistent idea, image, desire, etc. the idea, image, desire, feeling, etc., itself. the state of being obsessed. the act of obsessing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: obsession (Thesaurus) obsessed obsessive 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