ex post facto

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English[edit]

Alternative forms[edit]

Etymology[edit]

From Latin ex (from) + post (after) + facto, ablative of factum (deed)

Adjective[edit]

ex post facto (not comparable)

  1. Retroactive
  2. (law) Formulated or enacted after some event, and then retroactively applied to it.
    • 1998, Daniel E. Troy, Retroactive Legislation‎, page 56:
      Coupled with the Constitution's proscription of ex post facto laws is a similar prohibition against bills of attainder.
    • 2009 Saturday, March 21, Jim McTague, “Would a Tax on Bonuses Be Constitutional?”, Barron's:
      That the tax would take effect after some of the payments were made also raises issues. Says former Attorney General Richard Thornburg, also in an e-mail: "Such legislation could well run afoul of constitutional restrictions on bills of attainder, ex post facto laws, laws impairing the obligations of contract, unauthorized takings of property and the like."

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