An interior convulsion, producing a distortion of the features and accompanied by inarticulate noises. It is infectious and, though intermittent, incurable. Liability to attacks of laughter is one of the characteristics distinguishing man from the animals -- these being not only inaccessible to the provocation of his example, but impregnable to the microbes having original jurisdiction in bestowal of the disease. Whether laughter could be imparted to animals by inoculation from the human patient is a question that has not been answered by experimentation. Dr. Meir Witchell holds that the infection character of laughter is due to the instantaneous fermentation of _sputa_ diffused in a spray. From this peculiarity he names the disorder _Convulsio spargens_.

A movement (usually involuntary) of the muscles of the face, particularly of the lips, 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. See Laugh, v. i.

the activity of laughing; the manifestation of joy or mirth of scorn; "he enjoyed the laughter of the crowd"

the Course asks us not to take the ego and its world seriously, for this makes them real in our minds; rather, we are urged to laugh gently at the ego thought system and all its seeming consequences, remembering at last to laugh at the " tiny, mad idea."

Laughter is a 1980 album by Ian Dury & The Blockheads, it would be the last studio album Dury would make for Stiff Records, and the last album he would make with The Blockheads until 1998's Mr. Love Pants though they would record 1 single Profoundly in Love With Pandora together.

An innate respiratory reflex involving a characteristic punctuated exhaling. Commonly evoked by initially fearful stimuli that are subsequently appraised as innocuous. May be evoked by nervousness, surprise, sadism, slapstick, social politeness, or humor. See also flight response.

1. A verbal/physical signal of happiness; to wit: a dog laughs with his tail; a man laughs with his voice and smile.

a behavior that we are all familiar with and have personal experience with

a good thing

the sound of laughing