to talk in a friendly, informal way to somebody

to exchange messages with somebody on the internet, when you can see and reply to messages immediately and have a written conversation

I've been chatting online with my best friend.

I use social media to chat about stuff as well.

talking, especially informal conversation

After a few more minutes of chat, she left.

That's enough chat from me—on with the music!

They say he's already married, but it's just idle chat.

He would never engage in chat with the servants.

There was some general chat about the weather before the interview started.

communication between people on the internet in which they see and reply to messages immediately and have a written conversation

Fans are invited to an online chat.

a guide to internet chat safety for children

You can take part in a live chat with the movie's director this afternoon.

There was much chat about it on internet message boards.

LEARNit Dictionary