retroaction

[re-troh-ak-shuhn]

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noun

action that is opposed or contrary to the preceding action.

Origin:
1560–70; retro- + action

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Retroaction is always a great word to know.

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a fool or simpleton; ninny.

an extraordinary or unusual thing, person, or event; an exceptional example or instance.

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Collins

World English Dictionary

retroaction (ˌrɛtrəʊˈækʃən)

—n
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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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retroaction

ret·ro·ac·tion