Usually means: Not valid; lacking legal force.
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We found 38 dictionaries that define the word invalid:

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

Art (1 matching dictionary)
  1. invalid: Dictionary of Philosophical Terms and Names

Business (5 matching dictionaries)
  1. invalid: Webster's New World Law Dictionary
  2. Glossary of Legal Terms (No longer online)
  3. Bouvier's Law Dictionary 1856 Edition (No longer online)
  4. invalid: Legal dictionary
  5. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)
  1. invalid: Encyclopedia

Medicine (2 matching dictionaries)
  1. online medical dictionary (No longer online)
  2. invalid: Medical dictionary

Science (2 matching dictionaries)
  1. Botanical Terms (No longer online)
  2. invalid: PlanetMath Encyclopedia

Slang (1 matching dictionary)
  1. Invalid: Urban Dictionary

Tech (1 matching dictionary)
  1. Dictionary for Avionics (No longer online)

(Note: See invalided as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Not valid; not true, correct, acceptable or appropriate.
noun:  (dated, sometimes offensive) Any person with a disability or illness.
noun:  (dated, sometimes offensive) A person who is confined to home or bed because of illness, disability or injury; one who is too sick or weak to care for themselves.
noun:  (archaic) A disabled member of the armed forces; one unfit for active duty due to injury.
adjective:  Suffering from disability or illness.
adjective:  Intended for use by an invalid.
verb:  (British, transitive) To exempt from (often military) duty because of injury or ill health.
verb:  (transitive) To make invalid or affect with disease.

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