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Definition of laughter:

  1. 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.


giggling, gag, haw-hawing, tittering, snorting, shouting, joke, roaring, cachinnation, jest, jape, guffawing, guffaw, crowing, heehaw, howling, cackle, sounds, laugh, chuckling, hilarity, merriment.

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