retroactive

• Se dit d'une loi, d'une règle ou d'une décision qui prend effet à une date antérieure à son adoption, c'est-à-dire à partir d'un moment dans le passé plutôt qu'à partir du présent ou de l'avenir.

Describes a law, rule, or decision that takes effect from a date in the past rather than from the present or future.

1. Having effect on the pastC1formal

   Describes a law, rule, or action that takes effect from a date in the past, rather than from the present or future.

   rétroactif

   • The new tax law was made retroactive to the beginning of the fiscal year.
   • The salary increase was applied retroactively for the previous three months.
   • A retroactive change to the contract caused confusion among the employees.

   Synonymesex post factoretrospective

   Antonymesforward-lookingfutureprospective

2. Influencing previous eventsC2formal

   Descriptive of any event, stimulus, or process that has an effect on the effects of events, stimuli, or processes that occurred previously.

   rétroactif

   • The therapy had a retroactive effect, altering the patient's memory of the trauma.
   • The new policy was retroactive, impacting decisions made years ago.
   • Scientists studied the retroactive influence of the initial conditions on the experiment's outcome.

   Synonymesex post factoretroretrospective