retroactive

1 of 2

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

retroactivity

2 of 2

noun

ret·​ro·​activity "+ 

1

: the quality or state of being retroactive

2

: the capacity of a bacterial agent in biological warfare to react upon the user

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

Adjective

They all received a retroactive pay raise.

The new tax will be retroactive to January 1.

Recent Examples on the Web

Adjective

Once 10 business units have autonomous agents running at scale, retroactive attribution becomes politically and technically nightmarish. — Andi Mann, Forbes.com, 8 July 2026

Their raises will be reflected a week from Friday, with back pay for the retroactive raises to come later. — Doug Ross, Chicago Tribune, 8 July 2026

The new budget is retroactive to July 1, so teachers and other state employees can expect to see the raises reflected in their next pay checks, a spokesperson for the North Carolina Department of Public Instruction told The Charlotte Observer. — Rebecca Noel, Charlotte Observer, 7 July 2026

Bubic was moved to the 60-day IR retroactive to May 15 with left elbow soreness. — Blair Kerkhoff, Kansas City Star, 6 July 2026

Word History

Etymology

Adjective

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

First Known Use

Adjective

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