[hash-tag] Digital Technology.
(on social-networking 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 object), verb (used without object), hashtagged, hashtagging.
to add a hashtag to (a word, topic, or message): Someone on Twitter just hashtagged the film festival.

2005–10; hash (mark) + tag1 (def 9c)

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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