Usually means: Person or thing that negates validity.
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We found 12 dictionaries that define the word invalidator:

General (10 matching dictionaries)
  1. invalidator: Merriam-Webster
  2. invalidator: Oxford Learner's Dictionaries
  3. invalidator: Collins English Dictionary
  4. invalidator: Vocabulary.com
  5. invalidator: Wiktionary
  6. invalidator: Dictionary.com
  7. invalidator: Rhymezone
  8. invalidator: FreeDictionary.org
  9. invalidator: Mnemonic Dictionary
  10. invalidator: TheFreeDictionary.com

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

(Note: See invalidate as well.)

Definitions from Wiktionary (invalidator)

noun:  One who, or that which, makes invalid.

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