definition of
laugh

[1] #1 laugh v. [express joy, express mirth] produce laughter. wn

[2] #2 laugh n. [laughter] the sound of laughing. wn

[3] #3 laugh n. a facial expression characteristic of a person laughing; "his face wrinkled in a silent laugh of derision". wn

[4] #4 laugh n. [joke, gag, jest, jape] a humorous anecdote or remark intended to provoke laughter; "he told a very funny joke"; "he knows a million gags"; "thanks for the laugh"; "he laughed unpleasantly at his own jest"; "even a schoolboy's jape is supposed to have some ascertainable point". wn