1. [n]  noisy talk
2. [n]  the high-pitched continuing noise made by animals (birds or monkeys)
3. [n]  the rapid series of noises made by the parts of a machine
4. [v]  speak (about unimportant matters) rapidly and incessantly
5. [v]  make noise as if chattering away; "The magpies were chattering in the trees"
6. [v]  chew the fat; shoot the breeze
7. [v]  cut unevenly with a chattering tool
8. [v]  click repeatedly or uncontrollably, as of teeth

Chatter
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1. \Chat"ter\, v. i. [imp. & p. p. {Chattered}; p. pr. &
   vb. n. {Chattering}.] [Of imitative origin. Cf. {Chat}, v. i.
   {Chitter}.]
   1. To utter sounds which somewhat resemble language, but are
      inarticulate and indistinct.
            The jaw makes answer, as the magpie chatters.
                                                  --Wordsworth.
   2. To talk idly, carelessly, or with undue rapidity; to
      jabber; to prate.
            To tame a shrew, and charm her chattering tongue.
                                                  --Shak.
   3. To make a noise by rapid collisions.
            With chattering teeth, and bristling hair upright.
                                                  --Dryden.
   

2. \Chat"ter\, v. t.
   To utter rapidly, idly, or indistinctly.
         Begin his witless note apace to chatter. --Spenser.
   

3. \Chat"ter\, n.
   1. Sounds like those of a magpie or monkey; idle talk; rapid,
      thoughtless talk; jabber; prattle.
            Your words are but idle and empty chatter.
                                                  --Longfellow.
   2. Noise made by collision of the teeth, as in shivering.