Definition of viral marketing noun from the Oxford Advanced Learner's Dictionary

 

viral marketing

 noun
noun
BrE
 
; NAmE
 
[uncountable] Email, Marketing
 
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a way of advertising in which information about a company’s products or services is sent by email to people who then send it on by email to other people they know See related entries: Email, Marketing Word Originfrom the idea of the information being passed on like a computer virus.
See the Oxford Advanced American Dictionary entry: viral marketing