/ Dictionary / Index O obsess: Meaning and Definition of Find definitions for: ob•sess Pronunciation: (ub-ses'), [key] — v.t. to dominate or preoccupy the thoughts, feelings, or desires of (a person); beset, trouble, or haunt persistently or abnormally: Suspicion obsessed him. —v.i. to think about something unceasingly or persistently; dwell obsessively upon something. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: obsess (Thesaurus) observer obsessed Related Content Daily Word Quiz: serendipity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language