Synonyms for retroactive
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- 1. retroactive (vs. proactive)
- usage: descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously
- 2. ex post facto, retroactive, retro, retrospective (vs. prospective)
- usage: affecting things past; "retroactive tax increase"; "an ex-post-facto law"; "retro pay"