Informal conversation.

A conversation to stop an argument or settle situations.

(totum pro parte, typically with definite article) The entirety of users in a chatroom or a single member thereof.

“The Chat just made a joke about my skills.”

To be engaged in informal conversation.

“I like to chat over a coffee with a friend.”

To talk more than a few words.

“I met my old friend in the street, so we chatted for a while.”

To talk of; to discuss.

“They chatted politics for a while.”