We found 34 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 (23 matching dictionaries)
- invalid, invalid: American Heritage Dictionary of the English Language [home, info]
- invalid: Merriam-Webster's Online Dictionary, 11th Edition [home, info]
- invalid: Cambridge International Dictionary of English [home, info]
- Invalid: Wiktionary [home, info]
- invalid: Webster's New World College Dictionary, 4th Ed. [home, info]
- invalid: The Wordsmyth English Dictionary-Thesaurus [home, info]
- invalid: Infoplease Dictionary [home, info]
- invalid: Dictionary.com [home, info]
- invalid (adj.): Online Etymology Dictionary [home, info]
- invalid: UltraLingua English Dictionary [home, info]
- invalid: Cambridge Dictionary of American English [home, info]
- Invalid, .invalid: Wikipedia, the Free Encyclopedia [home, info]
- invalid: Cambridge International Dictionary of Phrasal Verbs [home, info]
- Invalid: Online Plain Text English Dictionary [home, info]
- invalid: Webster's Revised Unabridged, 1913 Edition [home, info]
- invalid: Rhymezone [home, info]
- Invalid: AllWords.com Multi-Lingual Dictionary [home, info]
- invalid: Webster's 1828 Dictionary [home, info]
- invalid: Free Dictionary [home, info]
- invalid: Mnemonic Dictionary [home, info]
- invalid: WordNet 1.7 Vocabulary Helper [home, info]
- invalid: LookWAYup Translating Dictionary/Thesaurus [home, info]
- invalid: Dictionary/thesaurus [home, info]
Art (1 matching dictionary)
- invalid: Dictionary of Philosophical Terms and Names [home, info]
Business (4 matching dictionaries)
- invalid: Webster's New World Law Dictionary [home, info]
- INVALID: Bouvier's Law Dictionary 1856 Edition [home, info]
- invalid: Legal dictionary [home, info]
- invalid: BusinessDictionary.com [home, info]
Computing (1 matching dictionary)
- invalid: Encyclopedia [home, info]
Medicine (2 matching dictionaries)
- invalid: online medical dictionary [home, info]
- invalid: Medical dictionary [home, info]
Science (2 matching dictionaries)
- Invalid: Biological Sciences Dictionary [home, info]
- invalid: Botanical Terms [home, info]
Tech (1 matching dictionary)
- Invalid: Dictionary for Avionics [home, info]
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Quick definitions (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")
▸ Word origin
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