Retroaction
Pronunciation : Re`tro*ac"tion
Part of Speech : n.
Etymology : [Cf. F. r?troaction.]
Definition : 1. Action returned, or action backward.
2. Operation on something past or preceding.
Source : Webster's Unabridged Dictionary, 1913
Merriam-Webster's Everyday Language Reference Set: Includes: The Merriam-Webster Dictionary, The Merriam-Webster Thesaurus, and The Merriam-Webster Vocabulary Builder