instant messaging Meaning in the Cambridge English Dictionary
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Meaning of “instant messaging” in the English Dictionary

"instant messaging" in British English

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instant messagingnoun [U]

uk   us  
a ​type of ​serviceavailable on the internet that ​allows you to ​exchange written ​messages with someone ​else who is using the ​service at the same ​time
(Definition of instant messaging from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"instant messaging" in Business English

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instant messagingnoun [U]

uk   us   ( abbreviation IM)
COMMUNICATIONS, INTERNET a ​serviceavailable on the ​internet that ​allows you to ​exchange written ​messages very quickly with someone who is using the ​internet at the same ​time: Sometimes the only way I can ​contact my ​intern is through ​instantmessaging.
(Definition of instant messaging from the Cambridge Business English Dictionary © Cambridge University Press)
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