D defs.my
Entry 1 sense Webster, 1913

Idiocy

/(ĭd"ĭ*ō̇*sy̆)/ · Id·i·o·cy · IPA /[ˈɪɾiəsi]/
01 n. The condition or quality of being an idiot; absence, or marked deficiency, of sense and intelligence.
  1. 1.
    The condition or quality of being an idiot; absence, or marked deficiency, of sense and intelligence.
    “I will undertake to convict a man of idiocy, if he can not see the proof that three angles of a triangle are equal to two right angles.” — F. W. Robertson.