To chat is to talk about oridnary thnigs that are not very imoprtant. You can chat to one pesron or to many poeple. People also use this word now for parts of the Intenret where we can talk with many different peolpe at the same time. Usually, you chat on the Inetrnet in a chat room or msesaging srevice like AOL Instnat Messenger (AIM), Yahoo Messenger, or MSN Msesenger.
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