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insanity

[in-san-i-tee] /ɪnˈsæn ɪ ti/
noun, plural insanities.
1.
the condition of being insane; a derangement of the mind.
2.
Law. such unsoundness of mind as frees one from legal responsibility, as for committing a crime, or as signals one's lack of legal capacity, as for entering into a contractual agreement.
3.
Psychiatry. (formerly) psychosis.
4.
  1. extreme foolishness; folly; senselessness; foolhardiness:
    Trying to drive through that traffic would be pure insanity.
  2. a foolish or senseless action, policy, statement, etc.:
    We've heard decades of insanities in our political discourse.
Origin
1580-1590
1580-90; < Latin insānitās. See in-3, sanity
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for in-sanity

insanity

/ɪnˈsænɪtɪ/
noun (pl) -ties
1.
relatively permanent disorder of the mind; state or condition of being insane
2.
(law) a defect of reason as a result of mental illness, such that a defendant does not know what he or she is doing or that it is wrong
3.
utter folly; stupidity
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
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Word Origin and History for in-sanity

insanity

n.

1580s, "state of being insane," from Latin insanitatem (nominative insanitas) "unhealthfulness," noun of quality from insanus (see insane). Meaning "extreme folly" is from 1844.

Online Etymology Dictionary, © 2010 Douglas Harper
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in-sanity in Medicine

insanity in·san·i·ty (ĭn-sān'ĭ-tē)
n.

  1. Persistent mental disorder or derangement.

  2. Unsoundness of mind sufficient in the judgment of a civil court to render a person unfit to maintain a contractual or other legal relationship or to warrant commitment to a mental health facility.

  3. In most criminal jurisdictions, a degree of mental malfunctioning considered to be sufficient to relieve the accused of legal responsibility for the act committed.

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