retroaction

noun
ret·ro·ac·tion | \ ˌre-trō-ˈak-shən \

Definition of retroaction 

1 [ retroactive ] : retroactive operation (as of a law or tax)

2 [ retro- + action ] : a reciprocal action : reaction

First Known Use of retroaction

1728, in the meaning defined at sense 1

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The first known use of retroaction was in 1728

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