<p><strong>Verb</strong></p><ul><li>(used without object) to talk rapidly in a foolish or purposeless way; jabber.</li><li>to utter a succession of quick, inarticulate, speechlike sounds, as monkeys or certain birds.</li><li>(used with object) to utter rapidly or purposelessly.</li><li>to cause to chatter, as the teeth from cold.</li></ul><p><strong>Noun</strong></p><ul><li>purposeless or foolish talk.</li><li>the act or sound of chattering.</li><li>a series of waves or ridges on the surface of a piece of metal that has been imperfectly drawn or extruded.</li><li>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.</li></ul>