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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 (30 matching dictionaries)

1. invalid: Merriam-Webster.com [home, info]
2. invalid, invalid: Oxford 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 (1 matching dictionary)

29. invalid: Dictionary of Philosophical Terms and Names [home, info]

Business (5 matching dictionaries)

30. invalid: Webster's New World Law Dictionary [home, info]
31. invalid: Glossary of Legal Terms [home, info]
32. INVALID: Bouvier's Law Dictionary 1856 Edition [home, info]
33. invalid: Legal dictionary [home, info]
34. invalid: BusinessDictionary.com [home, info]

Computing (1 matching dictionary)

35. invalid: Encyclopedia [home, info]

Medicine (2 matching dictionaries)

36. invalid: online medical dictionary [home, info]
37. invalid: Medical dictionary [home, info]

Science (2 matching dictionaries)

38. invalid: Botanical Terms [home, info]
39. invalid: PlanetMath Encyclopedia [home, info]

Slang (1 matching dictionary)

40. Invalid: Urban Dictionary [home, info]

Tech (1 matching dictionary)

41. Invalid: Dictionary for Avionics [home, info]

(Note: See invalids for more definitions.)

Quick definitions from Macmillan ( ) 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 ▸ Words similar to invalid ▸ Usage examples for invalid ▸ Popular adjectives describing invalid ▸ Popular nouns described by invalid ▸ Words that often appear near invalid ▸ Rhymes of invalid ▸ Invented words related to invalid