Definition of instant messaging noun from the Oxford Advanced Learner's Dictionary

 

instant messaging

 noun
noun
BrE BrE//ˌɪnstənt ˈmesɪdʒɪŋ//
 
; NAmE NAmE//ˌɪnstənt ˈmesɪdʒɪŋ//
 
[uncountable] Using the Internet
 
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a system on the Internet that allows people to exchange written messages with each other very quickly See related entries: Using the Internet
See the Oxford Advanced American Dictionary entry: instant messaging