in validity

noun

lack of validity.

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

Dictionary.com Unabridged

noun

invalidism.

Origin:
1905–10; invalid¹ + -ity

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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In validity is always a great word to know.

So is ninnyhammer. Does it mean:

a fool or simpleton; ninny.

a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

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Collins

World English Dictionary

invalid¹ (ˈɪnvəˌliːd, -lɪd)

—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)

—*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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Matching Quote

"It has often been argued that absolute scepticism is self-contradictory; but this is a mistake: and even if it were not so, it would be no argument against the absolute sceptic, inasmuch as he does not admit that no contradictory propositions are true. Indeed, it would be impossible to move such a man, for his scepticism consists in considering every argument and never deciding upon its validity; he would, therefore, act in this way in reference to the arguments brought against him."

-Charles Sanders Peirce

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in validity

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