/ Dictionary / Index O opt: Meaning and Definition of Find definitions for: opt Pronunciation: (opt), [key] — v.i. to make a choice; choose (usually fol. by for). to decide to leave or withdraw: to opt out of the urban rat race and move to the countryside. opt. Pronunciation: [key] optative. optical. optician. optics. optional. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: opt (Thesaurus) -opsy optative Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language