retroactive

[re-troh-ak-tiv]
adjective
1.
operative with respect to past occurrences, as a statute; retrospective: a retroactive law.
2.
pertaining to a pay raise effective as of a past date.

Origin:
1605–15; retro- + active

retroactively, adverb
retroactivity, noun
nonretroactive, adjective
nonretroactively, adverb
nonretroactivity, noun
unretroactive, adjective
unretroactively, adverb
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World English Dictionary
retroactive (ˌrɛtrəʊˈæktɪv)
 
adj
1.  applying or referring to the past: retroactive legislation
2.  effective or operative from a date or for a period in the past
 
retro'actively
 
adv
 
retro'activeness
 
n
 
retroac'tivity
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

retroactive
1611, from Fr. rétroactif (fem. rétroactive) "casting or relating back," from L. retroactus, pp. of retroagere "drive or turn back," from retro- "back" + agere "to drive, set in motion" (see act).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Science can't retroactively fit theory to future facts.
The formula should be modifiable over time and even applied retroactively if
  necessary.
Last year's salary increases will be paid retroactively.
But the new law imposed tough restrictions on shelters, and did so
  retroactively.
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