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chat (n.)

1520s, "chatter, frivolous talk;" see chat (v.). Meaning "familiar conversation" is from 1570s. As a name for birds with chattering cries, 1690s. Chat show for what in U.S. is a talk show is attested from 1969. Chat room in the online sense is attested by 1994, from the days when AOL ruled the World Wide Web.

chat (v.)

mid-15c., "talk idly, babble," short for chatter (v.). Meaning "to converse familiarly" is from 1550s. Sense of "flirt with, ingratiate oneself with" (later often with up (adv.)) is from 1898. Related: Chatted; chatting.