Dictionary![]() ![]() lu•na•cyPronunciation: (lOO'nu-sē), [key] —n., —pl. -cies. 1. insanity; mental disorder. 2. intermittent insanity, formerly believed to be related to phases of the moon. 3. extreme foolishness or an instance of it: Her decision to resign was sheer lunacy. 4. Law.unsoundness of mind sufficient to incapacitate one for civil transactions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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