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retroaction

[re-troh-ak-shuh n] /ˌrɛ troʊˈæk ʃən/
noun
1.
action that is opposed or contrary to the preceding action.
Origin
1560-1570
1560-70; retro- + action
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for retro-action

retroaction

/ˌrɛtrəʊˈækʃən/
noun
1.
an action contrary or reciprocal to a preceding action
2.
a retrospective action, esp a law affecting events prior to its enactment
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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