in·va·lid·i·ty

1 [in-vuh-lid-i-tee]
noun
lack of validity.

Origin:
1540–50; < Medieval Latin invaliditās. See invalid2, -ity

Dictionary.com Unabridged

in·va·lid·i·ty

2 [in-vuh-lid-i-tee]
noun

Origin:
1905–10; invalid1 + -ity

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To invalidity
00:10
Invalidity is always a great word to know.
So is callithumpian. Does it mean:
a chattering or flighty, light-headed person.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Collins
World English Dictionary
invalid1 (ˈɪnvəˌliːd, -lɪd) [Click for IPA pronunciation guide]
 
n
1.  a.  a person suffering from disablement or chronic ill health
 b.  (as modifier): an invalid chair
 
adj
2.  suffering from or disabled by injury, sickness, etc
 
vb
3.  to cause to become an invalid; disable
4.  chiefly (Brit) (usually foll by out; often passive) to require (a member of the armed forces) to retire from active service through wounds or illness
 
[C17: from Latin invalidus infirm, from in-1 + validus strong]
 
usage  It is best to avoid using the term invalid when referring to people with chronic illnesses or disabilities
 
inva'lidity1
 
n

invalid2 (ɪnˈvælɪd) [Click for IPA pronunciation guide]
 
adj
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
 
[C16: from Medieval Latin invalidus without legal force; see invalid1]
 
invalidity2
 
n
 
in'validness2
 
n
 
in'validly2
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
If a participant was not scanned, all invalidity codes are missing.
Not that it alters the invalidity of your conclusion.
Certificates of dissolution of marriage or declaration of invalidity of marriage.
As you can see, the invalidity of these arguments is obvious when you're not an advocate in the controversy.
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