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Influencing or applying to a period prior to enactment: a retroactive pay increase.
[French rétroactif, from Latin retroāctus, past participle of retroagere, to drive back : retrō-, retro- + agere, to drive; see ag- in Indo-European roots.]
1. applying or referring to the past: retroactive legislation.
2. effective or operative from a date or for a period in the past
ˌretroˈactiveness, ˌretroacˈtivity n
ret•ro•ac•tive(ˌrɛ troʊˈæk tɪv)
1. operative with respect to past occurrences, as a statute.
2. (of a pay raise) effective as of a past date.
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|Adj.||1.||retroactive - descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously|
proactive - descriptive of any event or stimulus or process that has an effect on events or stimuli or processes that occur subsequently; "proactive inhibition"; "proactive interference"
|2.||retroactive - affecting things past; "retroactive tax increase"; "an ex-post-facto law"; "retro pay"|
retrospective - concerned with or related to the past; "retrospective self-justification"