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idiotism1

[id-ee-uh-tiz-uh m]
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noun
  1. idiotic conduct or action.
  2. idiocy.
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Origin of idiotism1

First recorded in 1585–95; idiot + -ism

idiotism2

[id-ee-uh-tiz-uh m]
noun Obsolete.
  1. an idiom.
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Origin of idiotism2

1580–90; < Latin idiōtismus < Greek idiōtismós a vulgar phrase, peculiar way of speaking
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for idiotism

idiotism

noun
  1. an archaic word for idiocy
  2. an obsolete word for idiom
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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