Definition of "laughter"
noun:
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The sound of laughing, produced by air so expelled; any similar sound.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
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.
from Wiktionary, Creative Commons Attribution/Share-Alike License -
A reason for merriment.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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