[ hash-tag ]
/ ˈhæʃˌtæg /
Digital Technology


(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.
a hash mark used in this way.

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

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

Nearby words

  1. hashhead,
  2. hashimite,
  3. hashimoto's disease,
  4. hashing,
  5. hashish,
  6. hasid,
  7. hasidean,
  8. hasidic,
  9. hasidim,
  10. hasidism

Origin of hashtag

2005–10; hash (mark) + tag1 (in the sense “a label or keyword”)

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for hashtag

British Dictionary definitions for hashtag


/ (ˈhæʃˌtæɡ) /


(on the Twitter website) a word or phrase preceded by a hash mark, used to denote the topic of a post
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012