verb (used without object)
to talk rapidly in a foolish or purposeless way; jabber.
to utter a succession of quick, inarticulate, speechlike sounds, as monkeys or certain birds.
to make a rapid clicking noise by striking together: His teeth were chattering from the cold.
Machinery. (of a cutting tool or piece of metal) to vibrate during cutting so as to produce surface flaws on the work.
verb (used with object)
to utter rapidly or purposelessly.
to cause to chatter, as the teeth from cold.
purposeless or foolish talk.
a series of waves or ridges on the surface of a piece of metal that has been imperfectly drawn or extruded.
the act or sound of chattering.
online, phone, radio, or other electronic communication among people, often involving a harmful political activity such as espionage or terrorism: Officials were able to intercept and identify a high level of terrorist chatter in the weeks before the bombing attempt.

1200–50; Middle English chateren; imitative

chatteringly, adverb
chattery, adjective
outchatter, verb (used with object)
unchattering, adjective

2. clatter, click. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chatter (ˈtʃætə)
1.  to speak (about unimportant matters) rapidly and incessantly; prattle
2.  (intr) (of birds, monkeys, etc) to make rapid repetitive high-pitched noises resembling human speech
3.  (intr) (of the teeth) to click together rapidly through cold or fear
4.  (intr) to make rapid intermittent contact with a component, as in machining, causing irregular cutting
5.  idle or foolish talk; gossip
6.  the high-pitched repetitive noise made by a bird, monkey, etc
7.  the rattling of objects, such as parts of a machine
8.  Also called: chatter mark the undulating pattern of marks in a machined surface from the vibration of the tool or workpiece
[C13: of imitative origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 13c., chateren "to twitter, gossip," earlier cheateren, chiteren, of echoic origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Monkeys and parrots wheeled and chattered through the trees.
They chattered incessantly and chased their reflections into windows.
Shipboard researchers and workers chattered enthusiastically about what the
  data meant and the hypotheses they might generate.
They all chattered about favorite bowl games and having been too excited to
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