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instant messaging

noun
🔊/ˌɪnstənt ˈmesɪdʒɪŋ/
🔊/ˌɪnstənt ˈmesɪdʒɪŋ/
 [uncountable]
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  1. a system on the internet that allows people to exchange written messages with each other very quickly即时通信（互联网的快捷信息传递系统）Topics Phones, email and the internetb2