From The Collaborative International Dictionary of English v.0.48:
Chatter \Chat"ter\, n. 1. Sounds like those of a magpie or monkey; idle talk; rapid, thoughtless talk; jabber; prattle. [1913 Webster]
Your words are but idle and empty chatter. --Longfellow. [1913 Webster]
2. Noise made by collision of the teeth, as in shivering. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Chatter \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. [1913 Webster]
The jaw makes answer, as the magpie chatters. --Wordsworth. [1913 Webster]
2. To talk idly, carelessly, or with undue rapidity; to jabber; to prate. [1913 Webster]
To tame a shrew, and charm her chattering tongue. --Shak. [1913 Webster]
3. To make a noise by rapid collisions. [1913 Webster]
With chattering teeth, and bristling hair upright. --Dryden. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Chatter \Chat"ter\, v. t. To utter rapidly, idly, or indistinctly. [1913 Webster]
Begin his witless note apace to chatter. --Spenser. [1913 Webster]