Definition of hashtag noun from the Oxford Advanced Learner's Dictionary

 

hashtag

 noun
noun
BrE BrE//ˈhæʃtæɡ//
 
; NAmE NAmE//ˈhæʃtæɡ//
 
Social networking
 
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a word or phrase with the symbol ‘#’ in front of it, included in some messages sent using the Twitter social networking service so that you can search for all messages with the same subject I often use hashtags to search for trending topics. See related entries: Social networking