verb (used without object)
to act in opposition; react.
to have reference to or influence on past occurrences.
Origin of retroact
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for retroact
Historical Examples of retroact
to act in opposition
to influence or have reference to past events
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