/ Dictionary / Index R reactivate: Meaning and Definition of Find definitions for: re•ac•ti•vate Pronunciation: (rē-ak'tu-vāt"), [key] — v., -vat•ed, -vat•ing. —v.t. to render active again; revive. —v.i. to be active again. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: reactivate (Thesaurus) reaction turbine reactive Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language