Definition of hashtag in English:

hashtag

Syllabification: hash·tag
Pronunciation: /ˈhaSHtaɡ
 
/

noun

1(On social media sites such as Twitter) a word or phrase preceded by a hash or pound sign (#) and used to identify messages on a specific topic: spammers often broadcast tweets with popular hashtags even if the tweet has nothing to do with them
More example sentences
  • Hash tags have become indices of popularity.
  • However, hashtag use was significantly higher among spammers.
  • Tony Hirst with the UK's Open University has a great tutorial on how to create a (tag or) word cloud based on a hashtag feed from Twitter.
1.1The hash or pound sign (#): Hunt mistook an @ for a hashtag while tweeting derogatory thoughts about him
More example sentences
  • These chats are all identified by a hashtag (#) that allows you to easily find and track a key word or topic that other educators are tweeting about.
  • The hash tag, or pound sign, before a word allows multiple users that aren't normally connected to instantly follow a specific term they are interested in.
  • In order to make posts easier for users to search for, tweets can include a hashtag, or pound symbol.

Definition of hashtag in:

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Word of the day dinkum
Pronunciation: ˈdiNGkəm
adjective
(of an article or person) genuine