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Hashtag vs Undefined - What's the difference?

hashtag | undefined |

As a noun hashtag

is (internet) a metadata tag, signaled by a preceding hash sign (#), used to label content.

As a verb hashtag

is (internet) to label (a message) with a hashtag.

As an adjective undefined is

lacking a definition or value.

hashtag

English

Noun

(en noun) (wikipedia hashtag)
  • (Internet) A metadata tag, signaled by a preceding hash sign (#), used to label content.
  • * 2007 Aug 25, Stowe Boyd, tweet, https://twitter.com/stoweboyd/status/226570552
    • I support the hash tag' convention: http://tiny url.com/2qttlb '
  • hashtag #factoryjoe #twitter
  • * 2009 , Paul McFedries, Pete Cashmore, Twitter Tips, Tricks, and Tweets
    • You can also search for a hashtag by typing a topic (without the
  • ) in the search box and clicking Search.
  • * 2009 , Alistair Croll, Sean Power, Complete Web Monitoring
    • While hashtags aren't formally part of Twitter, some clients, such as Tweetdeck, will persist hashtags across replies to create a sort of message threading.
  • * 2011 , Rory Stewart, "Here we go again", London Review of Books , 33.VII:
    • The planes are moving into position. The foreign ministers of minor Arab states are taking calls on their cell-phones from Western politicians. Twitter accounts explode around the Libyan hash-tag .
  • (informal) The hash sign itself.

    • Derived terms

    * bashtag

    Verb

    (hashtagg)
  • (Internet) To label (a message) with a hashtag.
    • ----

    undefined

    English

    Adjective

    (wikipedia undefined) (-)
  • Lacking a definition or value.
  • (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
    • The result of division by zero is undefined .

    Antonyms

    * defined