Alternative forms 
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.
Wikipedia laughter (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.
- 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 Thomas Browne
- Archly the maiden smiled, and with eyes overrunning with laughter - Henry Wadsworth Longfellow
- (archaic) A reason for merriment
Related terms 
sound (as) of laughing
- Japanese: 笑い声 (ja) (わらいごえ, waraigoe), 笑い (ja) (わらい, warai)
- Macedonian: смеа (mk) (sméa) f
- Navajo: dloh
- Norwegian: latter (no)
- Occitan: ris (oc), risada (oc)
- Persian: خنده (fa) (xande)
- Portuguese: risada (pt) f, risos (pt) m
- Romanian: râs (ro) n, râset (ro)
- Romansch: riez (rm), riöz (rm), riem (rm), risada (rm), risaglia (rm)
- Russian: смех (ru) (smex) m, хохот (ru) (xóxot) m
- Sardinian: risida (sc)
- Scottish Gaelic: gàire (gd) f
- Serbo-Croatian: smijȇh (sh) m, hȉhōt (sh) m
- Slovak: smiech (sk) m
- Spanish: risa (es)
- Swedish: skratt (sv) n
- Turkish: kahkaha (tr), gülüş (tr)
movement of the muscles of the laughing face
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Translations to be checked