/ Dictionary / Index I inactivate: Meaning and Definition of Find definitions for: in•ac•ti•vate Pronunciation: (in-ak'tu-vāt"), [key] — -vat•ed, -vat•ing. to make inactive: The bomb was inactivated. to stop the activity of (certain biological substances). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: inactivate (Thesaurus) inaction inactive Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language