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

hashtag

noun
 
/ˈhæʃtæɡ/
 
/ˈhæʃtæɡ/
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  1. a word or phrase with the symbol ‘#’ in front of it, used on social media sites and apps so that you can search for content with the same subject
    • Use hashtags and trends to draw attention to your content and engage your fans.
    Topics Phones, email and the internetc2
  2. (British English also hash, hash sign)
    (North American English also pound sign)
    the symbol ( # ), especially one on a phone or computer keyboard

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