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hashtag

[hash-tag] /ˈhæʃˌtæg/
noun
1.
(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.
2.
a hash mark used in this way.
verb (used with object), verb (used without object), hashtagged, hashtagging.
3.
to add a hashtag to (a word, topic, or message):
Someone on Twitter just hashtagged the film festival.
Origin
2005-2010
2005-10; hash (mark) + tag1 ( def 9c )
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for hash-tag

hashtag

/ˈhæʃˌtæɡ/
noun
1.
(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
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10
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