retroactive

adjective

ret·​ro·​ac·​tive ˌre-trō-ˈak-tiv 

: extending in scope or effect to a prior time or to conditions that existed or originated in the past

especially : made effective as of a date prior to enactment, promulgation, or imposition

retroactive tax

retroactively adverb

retroactivity

ˌre-trō-ˌak-ˈti-və-tē 

noun

Did you know?

We normally think of time as constantly moving forward. Since retroactive seems to defy time's forward movement, retroactive taxes, laws, and regulations are often seen as particularly obnoxious and unfair. But nobody ever objects to receiving a retroactive raise at work. When we judge historical people and events in terms of present-day morality and attitudes, our retroactive judgments may indicate that we're too impressed with ourselves and ignorant of history.

Examples of retroactive in a Sentence

They all received a retroactive pay raise.

The new tax will be retroactive to January 1.

Recent Examples on the Web

On the chance Prop 40 passes, Prop 42 also effectively neuters the other measure by preventing any new retroactive tax, as 40 does. — Dominic Patten, Deadline, 14 Oct. 2026

So Florida saddled up his eligibility case as NCAA attorneys have begun navigating the retroactive products of their new five-in-five model, which will allow players to play five seasons in five years. — Noah White, Miami Herald, 14 Oct. 2026

Paviour clarified that the ballot measure was retroactive to respond as attendees asked about what would happen if billionaires left California. — Sacbee.com, 9 Oct. 2026

And the retroactive nature of the proposal raises potential constitutional questions that some rich folks would be only too happy to test in court. — Jack Dolan, Los Angeles Times, 7 Oct. 2026

Word History

Etymology

French rétroactif, from Latin retroactus, past participle of retroagere to drive back, reverse, from retro- + agere to drive — more at agent

First Known Use

1611, in the meaning defined above

Rhymes for retroactive

• attractive
• contractive
• extractive
• inactive
• proactive
• reactive
• refractive
• subtractive
• active
• tractive
• bioactive
• hyperactive

Kids Definition

retroactive

adjective

ret·​ro·​ac·​tive ˌre-trō-ˈak-tiv 

: intended to apply or take effect at a date in the past

a retroactive pay raise

retroactively adverb

Medical Definition

retroactive

adjective

ret·​ro·​ac·​tive ˌre-trō-ˈak-tiv 

: having relation or reference to or efficacy in a prior time

specifically : relating to, caused by, or being obliteration of the results of learning by immediately subsequent activity

retroactive inhibition

Legal Definition

retroactive

adjective

ret·​ro·​ac·​tive ˌre-trō-ˈak-tiv 

: extending in scope or effect to a prior time or to conditions that existed or originated in the past

especially : made effective as of a date prior to enactment, promulgation, or imposition

a retroactive tax

see also ex post facto law

retroactively adverb

retroactivity

-ak-ˈti-və-tē 

noun