/ ˈlɑːftə(r); NAmE ˈlæf-/ noun
[ U ] the act or sound of laughing :
to roar with laughter
tears / gales / peals / shrieks of laughter
to burst / dissolve into laughter
a house full of laughter (= with a happy atmosphere)
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WORD ORIGIN
Old English hleahtor , of Germanic origin; related to German Gelächter , also to laugh .