(v.i.) To act backward or in return; to act in opposition; to be retrospective.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). retroact. Retrieved September 20, 2026, from http://smartdefine.org/retroact/definitions/2055393 |
| Chicago | Webster's. 2011. "retroact" http://smartdefine.org/retroact/definitions/2055393 (accessed September 20, 2026). |
| Harvard | Webster's 2011, retroact, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/retroact/definitions/2055393>. |
| MLA | Webster's. "retroact" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/retroact/definitions/2055393> |