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We found 43 dictionaries with English definitions that include the word invalid:
Click on the first link on a line below to go directly to a page where "invalid" is defined.

General dictionaries General (30 matching dictionaries)
  1. invalid: Merriam-Webster.com [home, info]
  2. invalid, invalid: Oxford Learner's Dictionaries [home, info]
  3. invalid, invalid: American Heritage Dictionary of the English Language [home, info]
  4. invalid: Collins English Dictionary [home, info]
  5. invalid: Vocabulary.com [home, info]
  6. invalid, invalid, invalid: Macmillan Dictionary [home, info]
  7. Invalid, invalid: Wordnik [home, info]
  8. invalid: Cambridge Advanced Learner's Dictionary [home, info]
  9. invalid: Wiktionary [home, info]
  10. invalid: Webster's New World College Dictionary, 4th Ed. [home, info]
  11. invalid: The Wordsmyth English Dictionary-Thesaurus [home, info]
  12. invalid: Infoplease Dictionary [home, info]
  13. invalid: Dictionary.com [home, info]
  14. invalid (adj.): Online Etymology Dictionary [home, info]
  15. invalid: UltraLingua English Dictionary [home, info]
  16. invalid: Cambridge Dictionary of American English [home, info]
  17. Invalid, .invalid: Wikipedia, the Free Encyclopedia [home, info]
  18. invalid: Cambridge International Dictionary of Phrasal Verbs [home, info]
  19. Invalid: Online Plain Text English Dictionary [home, info]
  20. invalid: Webster's Revised Unabridged, 1913 Edition [home, info]
  21. invalid: Rhymezone [home, info]
  22. Invalid: AllWords.com Multi-Lingual Dictionary [home, info]
  23. invalid: Webster's 1828 Dictionary [home, info]
  24. invalid: Free Dictionary [home, info]
  25. invalid: Mnemonic Dictionary [home, info]
  26. invalid: WordNet 1.7 Vocabulary Helper [home, info]
  27. invalid: LookWAYup Translating Dictionary/Thesaurus [home, info]
  28. invalid: Dictionary/thesaurus [home, info]

Art dictionaries Art (1 matching dictionary)
  1. invalid: Dictionary of Philosophical Terms and Names [home, info]

Business dictionaries Business (5 matching dictionaries)
  1. invalid: Webster's New World Law Dictionary [home, info]
  2. invalid: Glossary of Legal Terms [home, info]
  3. INVALID: Bouvier's Law Dictionary 1856 Edition [home, info]
  4. invalid: Legal dictionary [home, info]
  5. invalid: BusinessDictionary.com [home, info]

Computing dictionaries Computing (1 matching dictionary)
  1. invalid: Encyclopedia [home, info]

Medicine dictionaries Medicine (2 matching dictionaries)
  1. invalid: online medical dictionary [home, info]
  2. invalid: Medical dictionary [home, info]

Science dictionaries Science (2 matching dictionaries)
  1. invalid: Botanical Terms [home, info]
  2. invalid: PlanetMath Encyclopedia [home, info]

Slang dictionaries Slang (1 matching dictionary)
  1. Invalid: Urban Dictionary [home, info]

Tech dictionaries Tech (1 matching dictionary)
  1. Invalid: Dictionary for Avionics [home, info]

(Note: See invalids for more definitions.)

Quick definitions from Macmillan (
American English Definition British English Definition

Provided by

Quick definitions from WordNet (invalid)

noun:  someone who is incapacitated by a chronic illness or injury
verb:  force to retire, remove from active duty, as of firemen
verb:  injure permanently
adjective:  having no cogency or legal force ("Invalid reasoning")
adjective:  no longer valid ("The license is invalid")

▸ Also see invalids
Word origin

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Popular nouns described by invalid

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Rhymes of invalid

Invented words related to invalid

Phrases that include invalid:   invalid page fault, imaginary invalid, invalid 1, invalid 2, invalid click, more...

Words similar to invalid:   disable, handicap, incapacitate, invalided, invaliding, invalidly, shut-in, null, more...

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