Definition of Retroactive 1. 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 2. Affecting things past Adjective Satellite Synonyms for word "retroactive" Semanticaly linked words with "retroactive" Antonyms to adjective "retroactive" Lexical Analysis for "retroactive" proactive descriptive of any event or stimulus or process that has an effect on events or stimuli or processes that occur subsequently has derived form retro- etymology nonretroactive etymology retroactively etymology retroactiveness etymology רטרואקטיבי [Hebrew] etymologically related retroaction etymologically related retroactively