1. a website or application where users can exchange messages in real time with other users, typically organized by topic or interest
Usage: often written as 'chat room' (two words) or 'chat-room' (hyphenated), though 'chatroom' is increasingly standard; informal

Examples

• She joined a chatroom dedicated to discussing her favorite TV show.
• The gaming chatroom was full of players looking for teammates.
• He spent hours in the chatroom talking to people from around the world.
• Many students use chatrooms to study together online.
• The chatroom moderator removed the user for posting inappropriate comments.
• I found helpful advice in the tech support chatroom.