[laf-ter, lahf-]
the action or sound of laughing.
an inner quality, mood, disposition, etc., suggestive of laughter; mirthfulness: a man of laughter and goodwill.
an expression or appearance of merriment or amusement.
Archaic. an object of laughter; subject or matter for amusement.

before 900; Middle English; Old English hleahtor; cognate with Old High German hlahtar, Old Norse hlātr; see laugh

laughterless, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
laughter (ˈlɑːftə)
1.  the action of or noise produced by laughing
2.  the experience or manifestation of mirth, amusement, scorn, or joy
[Old English hleahtor; related to Old Norse hlātr]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. hleahtor, from P.Gmc. *hlahtraz (cf. O.N. hlatr, Ger. Gelächter); see laugh.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The audience at the law school can be heard breaking out in laughter.
Laughter with friends releases endorphins, the brain's.
Laughter spreads through the room, and even a chuckle can be heard from the
  usually aloof king.
But when a certain writer pulled off a sick pogo butterfly move, the only thing
  it garnered was derisive laughter.
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