RETROACTIVE /ˌɹɛt.ɹəʊˈæk.tɪv/ ► audio Scrabble 16 Words With Friends 18 Definition adjective descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously. adjective affecting things past. — synonyms: ex_post_facto, retro See all 382 words you can make from RETROACTIVE → 11-letter words Words starting with R Words ending with E ← Unscramble different letters