Longman Dictionary of Contemporary English homepage

retroactive

 adjective
     
Related topics: Law
ret‧ro‧ac‧tive formal
BSCL a law or decision that is retroactive is effective from a particular date in the past [= retrospective]:
a retroactive pay increase
retroactive to
The legislation is retroactive to 1st June.
—retroactively adverb
Definition from the Longman Dictionary of Contemporary English
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