retroactive [re-troh- ak-tiv] Word Origin See more synonyms for retroactive on Thesaurus.com operative with respect to past occurrences, as a statute; retrospective: a retroactive law. pertaining to a pay raise effective as of a past date. Related forms ret·ro·ac·tive·ly, adverb ret·ro·ac·tiv·i·ty, noun non·ret·ro·ac·tive, adjective non·ret·ro·ac·tive·ly, adverb non·ret·ro·ac·tiv·i·ty, noun un·ret·ro·ac·tive, adjective un·ret·ro·ac·tive·ly, adverb
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for non-retroactivity applying or referring to the past retroactive legislation effective or operative from a date or for a period in the past Derived Forms retroactively, adverb retroactiveness or retroactivity, noun
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
Word Origin and History for non-retroactivity retroactive adj.
1610s, from French
rétroactif (16c.) "casting or relating back," from Latin retroact-, past participle stem of retroagere "drive or turn back," from retro- "back" (see retro-) + agere "to drive, set in motion" (see act (v.)). Related: Retroactively.
Online Etymology Dictionary, © 2010 Douglas Harper