1. to act in return or in response
Usage: formal
2. to have a backward or reverse effect
Usage: formal

Examples

• The new policy will retroact on previous decisions.
• The medication may retroact with other treatments.
• The committee decided to retroact against the proposed changes.
• The law was designed to retroact on earlier cases.
• The system will retroact to its original settings.
• The organization chose to retroact rather than move forward.