retroactive
1. [ adjective ] (psychology) descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously
Related terms: proactive psychology
2. [ adjective ] affecting things past
Synonyms: retro ex_post_facto
Examples:

"retroactive tax increase" "an ex-post-facto law" "retro pay"

Related terms: retrospective
3. [ adjective ] affecting things past
Synonyms: ex_post_facto
Examples:

"retroactive tax increase" "an ex-post-facto law" "retro pay"

Related terms: retrospective
Similar spelling:   retroactively
  retrospective
  retractile
  retracted
  retrospect
  retraction
  retrogressive
  retrograde
  retractable
  retrospection
  retractor