| a branch of a computer network in which participants can engage in real-time discussions with one another. |
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chat·room  (chāt'rōōm', -rŏŏm') n. A site on a computer network where online conversations are held in real time by a number of users. |
A service provided by certain ISPs that allows a group of people to communicate with each other by typing at their keyboards.
Note: Chat rooms can facilitate free-flowing conversations ranging from a discussion about pop music to friendly banter.