- (n.) A morbid suspension of good sense or judgment, as through fanaticism.
- (n.) 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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). lunacy. Retrieved September 24, 2026, from http://smartdefine.org/lunacy/definitions/2029207 |
| Chicago | Webster's. 2011. "lunacy" http://smartdefine.org/lunacy/definitions/2029207 (accessed September 24, 2026). |
| Harvard | Webster's 2011, lunacy, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/lunacy/definitions/2029207>. |
| MLA | Webster's. "lunacy" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/lunacy/definitions/2029207> |