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invalid2

[in-val-id] /ɪnˈvæl ɪd/
adjective
1.
not valid; without force or foundation; indefensible.
2.
deficient in substance or cogency; weak.
3.
void or without legal force, as a contract.
Origin
1625-1635
1625-35; < Medieval Latin invalidus, Latin: weak; see invalid1
Related forms
invalidly, adverb
invalidness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for invalidness

invalid1

/ˈɪnvəˌliːd; -lɪd/
noun
1.
  1. a person suffering from disablement or chronic ill health
  2. (as modifier): an invalid chair
adjective
2.
suffering from or disabled by injury, sickness, etc
verb (transitive)
3.
to cause to become an invalid; disable
4.
(usually foll by out; often passive) (mainly Brit) to require (a member of the armed forces) to retire from active service through wounds or illness
Derived Forms
invalidity, noun
Usage note
It is best to avoid using the term invalid when referring to people with chronic illnesses or disabilities
Word Origin
C17: from Latin invalidus infirm, from in-1 + validus strong

invalid2

/ɪnˈvælɪd/
adjective
1.
not valid; having no cogency or legal force
2.
(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 Forms
invalidity (ˌɪnvəˈlɪdɪtɪ), invalidness, noun
invalidly, adverb
Word Origin
C16: from Medieval Latin invalidus without legal force; see invalid1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for invalidness

invalid

adj.

"not strong, infirm," 1640s, from Latin invalidus "not strong, infirm, weak, feeble," from in- "not" (see in- (1)) + validus "strong" (see valid). Specific meaning "infirm from sickness, disease, or injury" is from 1640s.

"of no legal force," 1630s, from special use of Latin invalidus (see invalid (adj.1)).

n.

1709, originally of disabled military men, from invalid (adj.1). Invalides is short for French Hôtel des Invalides, home for old and disabled soldiers in the 7th arrondissement of Paris.

Online Etymology Dictionary, © 2010 Douglas Harper
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invalidness in Medicine

invalid in·va·lid1 (ĭn'və-lĭd)
n.
One who is incapacitated by a chronic illness or disability. adj.
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.
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