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Definition of: lunacy
(l′nə·sē) noun plural ·cies
1. An intermittent form of insanity: formerly supposed to depend on the changes of the moon.
2. In forensic psychiatry and law, mental unsoundness to the point of irresponsibility.
3. Wild foolishness; wanton and senseless conduct. See synonyms under INSANITY. [<LUNATIC]
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