noun, plural id·i·o·cies.

  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.

noun plural -cies

  1. (not in technical usage) severe mental retardation
  2. foolishness or senselessness; stupidity
  3. a foolish act or remark

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


  1. The state or condition of being an idiot; profound mental retardation.
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