/ Dictionary / Index A activize: Meaning and Definition of Find definitions for: ac•tiv•ize Pronunciation: (ak'tu-vīz"), [key] — -ized, -iz•ing. to make active; activate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. activity acto Related Content Daily Word Quiz: reluctant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language