What is the meaning of Laughter?

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

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.

A reason for merriment.

Laughing; the making of laughs.

1. An instance or bout of laughter.

An instance or bout of laughter.

A humorous matter; something worthy of derision.

Source: wiktionary.org