1. (on social media websites) a word or phrase preceded by a hash mark (#), used within a message to identify a keyword or topic of interest and facilitate a search for it: The hashtag #sandiegofire was used to help coordinate an emergency response to the fire.
  2. a hash mark used in this way.

verb (used with or without object), hash·tagged, hash·tag·ging.

  1. to add a hashtag to (a word, topic, or message): Someone on Twitter just hashtagged the film festival.


  1. (on the Twitter website) a word or phrase preceded by a hash mark, used to denote the topic of a post

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