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Origin of idiocrasy

1675–85; < Greek idiokrāsía, equivalent to idio- idio- + -krāsia, equivalent to krâs(is) mixture (see crasis) + -ia -y3; see idiosyncrasy
Related formsid·i·o·crat·ic [id-ee-uh-krat-ik] /ˌɪd i əˈkræt ɪk/, id·i·o·crat·i·cal, adjectiveid·i·o·crat·i·cal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for idiocrasy

"peculiarity," 1680s, from Greek idiokrasia, from idio- (see idio-) + krasis "mixing, tempering" (see rare (adj.2)).

Online Etymology Dictionary, © 2010 Douglas Harper