Laughter definitions

lăf'tər, läf'-
The act of laughing.
noun
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The sound produced by laughing.
noun
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The action of laughing or the sound resulting.
noun
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An indication of mirth or amusement.

With laughter in her eyes.

noun
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A cause or subject for laughter.
noun
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A matter for or cause of laughter.
noun
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Laughter is defined as the sound of mirth or joy.

Laughter is the sound you make when you hear a really funny joke that makes you giggle.

noun
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The sound of laughing, produced by air so expelled; any similar sound.

Their loud laughter betrayed their presence.

noun
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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.

noun
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(archaic) A reason for merriment.
noun
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Origin of laughter

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 Gelächter (“laughter, hilarity, merriment"), Danish and Norwegian latter (“laughter"), Icelandic hlátur (“laughter"). More at laugh.