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About Our Definitions: All forms of a word (noun, verb, etc.)
are now displayed on one page. Definition of RETROACTIVE :
extending in scope or effect to a prior time or to conditions
that existed or originated in the past; especially: made
effective as of a date prior to enactment, promulgation, or
imposition <retroactive tax> : having relation or reference to
or efficacy in a prior time; specifically: relating to, caused
by, or being obliteration of the results of learning by
immediately subsequent activity <retroactive inhibition>