to talk or converse in a light, easy, informal manner
Comput. to hold an electronic conversation by exchanging typed messages: the messages appear on each participant's computer screen as they are typed
noun
small talk; chitchat: a letter filled with chat about books
an easy, informal talk or conversation
any of various passerine birds with a chattering call
☆ any of several songbirds of various families characterized by a chattering song; esp., a yellow-breasted wood warbler (Icteria virens) of North America