Definitions from Wiktionary ( )

▸ verb:  To be engaged in informal conversation.
▸ verb:  To talk more than a few words.
▸ verb:  (transitive) To talk of; to discuss.
▸ verb:  (informal, slang, often as chatting) To chat shit (to speak nonsense, to lie).
▸ verb:  To exchange text or voice messages in real time through a computer network, as if having a face-to-face conversation.
▸ verb:  (by extension, Philippines) To send a text message via Facebook Messenger instead of via SMS.
▸ noun:  (countable, uncountable) Informal conversation.
▸ noun:  (countable, uncountable) An exchange of text or voice messages in real time through a computer network, resembling a face-to-face conversation.
▸ noun:  (Internet, uncountable, with or without "the") A chat room, especially (in later use) one accompanying a videoconference or live stream.
▸ noun:  (metonymically, video games) The entirety of users, viewed collectively, in a chat room, especially the chat room accompanying a live stream.
▸ noun:  (by extension, nonstandard, humorous) Familiar term of address for users on social media other than a chat room, as in "guys."
▸ noun:  (countable) Any of various small Old World passerine birds in the muscicapid tribe Saxicolini or subfamily Saxicolinae that feed on insects.
▸ noun:  (countable) Any of several small Australian honeyeaters in the genus Epthianura.
▸ noun:  A small potato, such as is given to swine.
▸ noun:  (mining, local use) Mining waste from lead and zinc mines.
▸ noun:  (British, Australia, New Zealand, World War I military slang) A louse (small, parasitic insect).
▸ noun:  Alternative form of chaat [Any savory snack, sold from a roadside stall in India, or served as a starter in an Indian restaurant.]
▸ noun:  Acronym of cultural-historical activity theory.

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