Longman Dictionary of Contemporary English homepage

Date: 1700-1800
Language: Latin
Origin: 'from a thing done afterward'

ex post facto law

 noun
     
Related topics: Law
ex post fac‧to law [countable] law
SCL a law that makes a particular action into a crime, and then punishes people who took that action before it had legally become a crime
Definition from the Longman Dictionary of Contemporary English
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