Definition of hashtag in English:

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hashtag

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 (#): Huntmistook an @ for a hashtag while tweeting derogatory thoughts about him
More example sentences
  • Similarly, putting a hashtag in front of a tag (such as #bushfire or #davos) lets you follow a thread on any given topic.
  • A word like ''follow'' (to subscribe to someone's Twitter feed), and the symbols @ (denoting an online name) and # (a ''hashtag,'' denoting a searchable topic) have specific meanings on Twitter that have begun to migrate across the entire Web and beyond.
  • The # symbol, called a hashtag, is used to mark keywords or topics in a tweet.

For editors and proofreaders

Syllabification: hash·tag

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