Longman Dictionary of Contemporary English homepage

retrospective

1 adjective
     
Related topics: Law
ret‧ro‧spec‧tive1 [usually before noun]
1 related to or thinking about the past:
a retrospective study of 110 patients
2SCLPG British English a law or decision that is retrospective is effective from a particular date in the past [= retroactive]:
retrospective legislation
Teachers settled for a 4.2% pay rise with retrospective effect from 1 April.
retrospectively adverb:
The new rule will be applied retrospectively.

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