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



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