ret·ro·ac·tion

[re-troh-ak-shuhn]
noun
action that is opposed or contrary to the preceding action.

Origin:
1560–70; retro- + action

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
retroaction (ˌrɛtrəʊˈækʃən) [Click for IPA pronunciation guide]
 
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
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00:10
Retroaction is always a great word to know.
So is ninnyhammer. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a fool or simpleton; ninny.
Example sentences
Phenomena contributing to negative transfer are investigated, and contributing factors to this retroaction are identified.
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