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retroactive

ret·ro·ac·tive

retroactive

 
pronunciation:
re tro aek tihv
features:
Word Parts
part of speech: adjective
definition: going into operation or effect as of a previous date, or in respect to past events or circumstances.
Fortunately, her pay raise is retroactive, and she'll receive additional money starting from last January.
derivation: retroactively (adv.)
Word Parts
The word retroactive contains the following parts:
retro- Latin prefix that means back, backward, behind