• WordNet 3.6
    • adj retroactive affecting things past "retroactive tax increase","an ex-post-facto law","retro pay"
    • adj retroactive descriptive of any event or stimulus or process that has an effect on the effects of events or stimuli or process that occurred previously
    • ***
Webster's Revised Unabridged Dictionary
    • a Retroactive Fitted or designed to retroact; operating by returned action; affecting what is past; retrospective.
    • ***
Century Dictionary and Cyclopedia
    • retroactive Retroacting; having a reversed or retrospective action; operative with respect to past circumstances; holding good for preceding cases.
    • ***


Webster's Revised Unabridged Dictionary
Cf. F. rétroactif,


In literature:

This bill raises the salaries of members from $1000 to $1500, an increase of fifty per cent, and is retroactive.
"Have faith in Massachusetts; 2d ed." by Calvin Coolidge
The apotheosis will be retroactive, nay, it has already taken place.
"The Life of Reason" by George Santayana
In other words, was the principle, newly recovered, to be applied retroactively?
"Stephen A. Douglas" by Allen Johnson
Is this new law you've promulgated retroactive?
"The Pride of Palomar" by Peter B. Kyne
It is to these people, and by retroaction, to yourselves, that you do harm when you govern unjustly.
"Superstition In All Ages (1732)" by Jean Meslier
So then I realised where Juggins retroactive existence is carrying him to.
"Behind the Beyond" by Stephen Leacock
The matter is so generally recognised that it has a sort of retroactive effect upon the historical ideas of the masses.
"The Cult of Incompetence" by Emile Faguet
Other countries have gone farther in retroactive measures in regard to alienated lands.
"The Economic Aspect of Geology" by C. K. Leith
That woman could not retroact and touch the memory of Ida.
"Stories by American Authors, Volume 7" by Various
Retroactive effect given to the law is a crime.
"The Writings Of Thomas Paine, Complete" by Thomas Paine

In poetry:

Done with the varying distress
Of retroactive consciousness!
Set free to feel the joy unknown
Of Life and Love beyond my own!
"Eternal Me" by Charlotte Perkins Stetson Gilman

In news:

Businesses that bought solar panels made in China earlier this year are retroactively being hit with unexpected tax bills, as they find themselves caught in the middle of a trade fight between US and Chinese manufacturers.
AFGE's new president to push for retroactive pay raise.
Good-time-credit amendment not retroactive .
The attorney general's office concluded Loomis' voter-approved term limit initiative can't be applied retroactively .
The councilmen and other Measure A opponents argued that under state law, term limits couldn't be applied retroactively and the attorney general's office agreed.
NBA weighs retroactive penalties for floppers.
"From what I can tell, it would be illegal for their plan to reduce pay retroactively ," he said.
Maryland lawmakers, facing a Monday deadline to adjourn and a $1 billion budget gap to close, settled Saturday on the largest pieces of a tax package that would apply retroactively .
Michigan Court of Appeals declines retroactive application of 'Padilla.
No Retroactive Benefits for Misclassified ICs.
The Court of Appeals also rejected Brown's argument that not retroactively applying the statute to him deprives him of Equal Protection.
The law has since been changed and now banks must give consumers 45-days notice before raising interest rates and often it's not allowed to be done retroactively .
Without the exemption, huge inventories of products that present no health risk to children could be rendered retroactively illegal, and future products prohibited from sale.
Congress most likely will extend many of these and other expired provisions retroactive to Jan 1, 2012.
News / Chicagoland RNC retroactive liveblogging but mostly punting .

In science:

Proactive interference refers to prior learning interfering with subsequent learning; retroactive interference refers to post hoc learning confounding the prior learning (Wickens & Hollands, 2000).
Human Information Processing with the Personal Memex
This contributes an effective additional force field in the vicinity of R α , which in turn retroacts on β , leading to an induced hydrodynamic interaction that remains finite at all times.
Screening of hydrodynamic interactions for polyelectrolytes in salt solution
Del Vecchio D, Ninfa A, Sontag E: Modular cell biology: retroactivity and insulation.
TinkerCell: Modular CAD Tool for Synthetic Biology
Read-once CFTP may be viewed as a retroactive stopping rule.
How to Couple from the Past Using a Read-Once Source of Randomness
Abhijit S. thanks for support provided by NASA of the retroactive analysis WFPC2 photometry zero-points through grant HST-AR-09216.01A from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.
The Hubble Constant: A Summary of the HST Program for the Luminosity Calibration of Type Ia Supernovae by Means of Cepheids