verb

• (transitive) To talk of; to discuss.
  "They chatted politics for a while."
• (informal, slang, often as chatting) To chat shit (to speak nonsense, to lie).
  "Don't listen to me, I'm chatting."

noun

• (countable, uncountable) Informal conversation.
  "It'd be cool to meet up again soon and have a quick chat."
• (countable, uncountable) An exchange of text or voice messages in real time through a computer network, resembling a face-to-face conversation.
  "Internet Relay Chat"
• (Internet, uncountable, with or without "the") A chat room, especially (in later use) one accompanying a videoconference or live stream.
  ""Type yes in (the) chat if you can hear me.""
• (Internet, uncountable, with or without "the") A chat room, especially (in later use) one accompanying a videoconference or live stream.
  "The chat just made a joke about my poor skillz."

noun

• (mining, local use) Mining waste from lead and zinc mines.
  "Frank had been looking at calcite crystals for a while now [...] among the chats or zinc tailings of the Lake County mines, down here in the silver lodes of the Vita Madre and so forth."

noun

• (British, Australia, New Zealand, World War I military slang) A louse (small, parasitic insect).
  "'Do officers have chats, then, the same as us?' 'Not the same, no. The chats they got is bigger and better, with pips on their shoulders and Sam Browne belts.'"