GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Lunacy , n.; pl. Lunacies . [See Lunatic.]
   Insanity or madness; properly, the kind of insanity which is broken by intervals of reason, -- formerly supposed to be influenced by the changes of the moon; any form of unsoundness of mind, except idiocy; mental derangement or alienation.
   Brande. Burrill.
   
   1913 Webster
   Your kindred shuns your house
   As beaten hence by your strange lunacy.
   Shak.
   
   1913 Webster
   A morbid suspension of good sense or judgment, as through fanaticism.
   Dr. H. More.
   Syn. -- Derangement; craziness; mania. See Insanity.
   1913 Webster