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idiocy

[id-ee-uh-see] /ˈɪd i ə si/
noun, plural idiocies.
1.
utterly senseless or foolish behavior; a stupid or foolish act, statement, etc.:
All this talk of zombies coming to attack us is pure idiocy.
2.
Psychology. (no longer in technical use; considered offensive) the state of being an idiot.
Origin of idiocy
1520-1530
1520-30; idio(t) + -cy; compare Greek idiōteía uncouthness
Synonyms
1. foolishness, inanity, folly.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for idiocy

idiocy

/ˈɪdɪəsɪ/
noun (pl) -cies
1.
(not in technical usage) severe mental retardation
2.
foolishness or senselessness; stupidity
3.
a foolish act or remark
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 idiocy
n.

1520s, from idiot on model of prophecy, etc. Early alternatives included idiotacy (1580s), idiotry (1590s).

Online Etymology Dictionary, © 2010 Douglas Harper
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idiocy in Medicine

idiocy id·i·o·cy (ĭd'ē-ə-sē)
n.
The state or condition of being an idiot; profound mental retardation.

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