(usually uncountable, plural laughters)
- The sound of laughing, produced by air so expelled; any similar sound.
- Their loud laughter betrayed their presence
- A movement (usually involuntary) of the muscles of the laughing face, particularly of the lips, and of the whole body, 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.
- (archaic) A reason for merriment
From Middle English, from Old English hleahtor (“laughter, jubilation, derision"), from Proto-Germanic *hlahtraz (“laughter"), from Proto-Indo-European *klek-, *kleg- (“to shout"). Cognate with German GelÃ¤chter (“laughter, hilarity, merriment"), Danish and Norwegian latter (“laughter"), Icelandic hlÃ¡tur (“laughter"). More at laugh.