Webster's English Dictionary

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idiotism

id.i.o.tism \'id-e--*-.tiz-*m\ \-e--*t-.iz-*m\ n [in sense 1, fr. MF 
   idiotisme, fr. L idiotismus common speech, fr.]Gk idio-tismos, fr. 
   idio-te-s; in sense 2, fr. idiot obs  1a: IDIOM  1b: IDIOM  archaic  2: 
   IDIOCY