Nearby words

  1. invade,
  2. invader,
  3. invaginable,
  4. invaginate,
  5. invagination,
  6. invalidate,
  7. invalidation,
  8. invalides, hôtel des,
  9. invalidism,
  10. invalidity

Origin of invalid

1635–45; < French invalide < Latin invalidus weak. See in-3, valid


[ in-val-id ]
/ ɪnˈvæl ɪd /


not valid; without force or foundation; indefensible.
deficient in substance or cogency; weak.
void or without legal force, as a contract.

Origin of invalid

1625–35; < Medieval Latin invalidus, Latin: weak; see invalid1

Related formsin·val·id·ly, adverbin·val·id·ness, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for invalid

British Dictionary definitions for invalid


/ (ˈɪnvəˌliːd, -lɪd) /


  1. a person suffering from disablement or chronic ill health
  2. (as modifier)an invalid chair


suffering from or disabled by injury, sickness, etc

verb (tr)

to cause to become an invalid; disable
(usually foll by out; often passive) mainly British to require (a member of the armed forces) to retire from active service through wounds or illness
Derived Formsinvalidity, noun

Word Origin for invalid

C17: from Latin invalidus infirm, from in- 1 + validus strong


It is best to avoid using the term invalid when referring to people with chronic illnesses or disabilities


not valid; having no cogency or legal force
logic (of an argument) having a conclusion that does not follow from the premises: it may be false when the premises are all true; not valid
Derived Formsinvalidity (ˌɪnvəˈlɪdɪtɪ) or invalidness, nouninvalidly, adverb

Word Origin for invalid

C16: from Medieval Latin invalidus without legal force; see invalid 1

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for invalid
Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for invalid


[ ĭnvə-lĭd ]


One who is incapacitated by a chronic illness or disability.


Incapacitated by illness or injury.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.