verb (used without object)

to act in opposition; react.
to have reference to or influence on past occurrences.

Origin of retroact

First recorded in 1785–95; retro- + act Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for retroact

Historical Examples of retroact

  • The concentric is the passive state, for when one experiences a deep emotion, he must retroact.

  • In all such eases, odd as it may sound, our judgment may actually be said to retroact and to enrich the past.

British Dictionary definitions for retroact


verb (intr)

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