- operative with respect to past occurrences, as a statute; retrospective: a retroactive law.
- pertaining to a pay raise effective as of a past date.
Origin of retroactive
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- applying or referring to the pastretroactive legislation
- effective or operative from a date or for a period in the past
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
Online Etymology Dictionary, © 2010 Douglas Harper