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retroact

[re-troh-akt] /ˈrɛ troʊˌækt/
verb (used without object)
1.
to act in opposition; react.
2.
to have reference to or influence on past occurrences.
Origin
1785-1795
1785-95; retro- + act
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for retro-act

retroact

/ˈrɛtrəʊˌækt/
verb (intransitive)
1.
to act in opposition
2.
to influence or have reference to past events
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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