(v.i.) A movement (usually involuntary) of the muscles of the face, particularly of the lips, with a peculiar expression of the eyes, indicating merriment, satisfaction or derision, and usually attended by a sonorous and interrupted expulsion of air from the lungs. See Laugh, v. i.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). laughter. Retrieved September 20, 2026, from http://smartdefine.org/laughter/definitions/2026887 |
| Chicago | Webster's. 2011. "laughter" http://smartdefine.org/laughter/definitions/2026887 (accessed September 20, 2026). |
| Harvard | Webster's 2011, laughter, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/laughter/definitions/2026887>. |
| MLA | Webster's. "laughter" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/laughter/definitions/2026887> |