retro-act

retroact

[re-troh-akt]
verb (used without object)
1.
to act in opposition; react.
2.
to have reference to or influence on past occurrences.

Origin:
1785–95; retro- + act

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World English Dictionary
retroact (ˈrɛtrəʊˌækt)
 
vb
1.  to act in opposition
2.  to influence or have reference to past events

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