'Laughter' definitions:

Definition of 'laughter'

(from WordNet)
noun
The sound of laughing [syn: laugh, laughter]
noun
The activity of laughing; the manifestation of joy or mirth or scorn; "he enjoyed the laughter of the crowd"

Definition of 'Laughter'

From: GCIDE
  • Laughter \Laugh"ter\, n. [AS. hleahtor; akin to OHG. hlahtar, G. gel[aum]chter, Icel. hl[=a]tr, Dan. latter. See Laugh, 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. [1913 Webster]
  • The act of laughter, which is a sweet contraction of the muscles of the face, and a pleasant agitation of the vocal organs, is not merely, or totally within the jurisdiction of ourselves. --Sir T. Browne. [1913 Webster]
  • Archly the maiden smiled, and with eyes overrunning with laughter. --Longfellow. [1913 Webster]