Usually means: Applying new rules to past events.
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We found 10 dictionaries that define the word retroactivity:

General (7 matching dictionaries)
  1. retroactivity: Merriam-Webster
  2. retroactivity: Oxford Learner's Dictionaries
  3. retroactivity: Collins English Dictionary
  4. Retroactivity, retroactivity: Wordnik
  5. retroactivity: Wiktionary
  6. retroactivity: Dictionary.com
  7. retroactivity: TheFreeDictionary.com

Business (2 matching dictionaries)
  1. retroactivity: Merriam-Webster Legal Dictionary
  2. retroactivity: Legal dictionary

Medicine (1 matching dictionary)
  1. retroactivity: Merriam-Webster Medical Dictionary

(Note: See retroactive as well.)

Definitions from Wiktionary (retroactivity)

noun:  The state or characteristic of being retroactive.
noun:  (law) The application of a law to events that took place before it was made.

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