Usually means: Make invalid; render null, void.
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We found 27 dictionaries that define the word invalidate:

General (23 matching dictionaries)
  1. invalidate: Merriam-Webster.com
  2. invalidate: Oxford Learner's Dictionaries
  3. invalidate: American Heritage Dictionary of the English Language
  4. invalidate: Collins English Dictionary
  5. invalidate: Vocabulary.com
  6. Invalidate, invalidate: Wordnik
  7. invalidate: Cambridge Advanced Learner's Dictionary
  8. invalidate: Wiktionary
  9. invalidate: Webster's New World College Dictionary, 4th Ed.
  10. invalidate: The Wordsmyth English Dictionary-Thesaurus
  11. invalidate: Infoplease Dictionary
  12. invalidate: Dictionary.com
  13. invalidate: Cambridge Essential American English Dictionary
  14. Invalidate: Online Plain Text English Dictionary
  15. invalidate: Webster's Revised Unabridged, 1913 Edition
  16. invalidate: Rhymezone
  17. Invalidate: AllWords.com Multi-Lingual Dictionary
  18. invalidate: Webster's 1828 Dictionary
  19. invalidate: Free Dictionary
  20. invalidate: Mnemonic Dictionary
  21. invalidate: Dictionary/thesaurus

Business (2 matching dictionaries)
  1. Glossary of Legal Terms (No longer online)
  2. invalidate: Legal dictionary

Computing (1 matching dictionary)
  1. invalidate: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

(Note: See invalidated as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
verb:  To make invalid. Especially applied to contract law.
verb:  To make or declare (an argument, statement, or theory) unsound or erroneous; disprove.
verb:  To render invalid; discredit.

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