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  1. INVALID Definition & Meaning - Merriam-Webster

    5 days ago · The meaning of INVALID is not valid. How to use invalid in a sentence.

  2. INVALID Definition & Meaning | Dictionary.com

    INVALID definition: an infirm or sickly person. See examples of invalid used in a sentence.

  3. INVALID | English meaning - Cambridge Dictionary

    INVALID definition: 1. An invalid document, ticket, law, etc. is not legally or officially acceptable: 2. An invalid…. Learn more.

  4. INVALID Simple Definition - Merriam-Webster

    not valid: such as; having no force or effect; not based on truth or fact : not logical or correct… See the full definition

  5. INVALID definition and meaning | Collins English Dictionary

    6 meanings: 1. a. a person with disablement or chronic ill health b. (as modifier) 2. incapacitated or disabled by injury,.... Click for …

  6. invalid Definition & Meaning - Dictionary.net

    The comprehensive definition of invalid. Includes pronunciation, synonyms, etymology, and usage examples to help you master this …

  7. invalid - Wiktionary, the free dictionary

    May 17, 2026 · invalid (third-person singular simple present invalids, present participle invaliding, simple past and past participle …

  8. INVALID | definition in the Cambridge English Dictionary

    INVALID meaning: 1. An invalid document, ticket, law, etc. is not legally or officially acceptable: 2. An invalid…. Learn more.

  9. INVALID definition in American English | Collins English Dictionary

    6 senses: 1. a. a person with disablement or chronic ill health b. (as modifier) 2. incapacitated or disabled by injury,.... Click for more …

  10. Invalid - Definition, Meaning & Synonyms | Vocabulary.com

    A person who is very sick or injured and needs frequent care is an invalid. Also, something no longer current or useful is invalid.