Retroact Definition
retrōakt
verb
To act in opposition; react.
Webster's New World
To have reference to or influence on things done in the past.
Webster's New World
Part or all of this entry has been imported from the 1913 edition of Webster's Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
Wiktionary
Origin of Retroact
-
retro- +"Ž act
From Wiktionary
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