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Wiktionary
hashtag

n. 1 (context Internet English) A metadata tag, signaled by a preceding hash sign, used to label content. 2 (context informal English) The hash sign itself. vb. (context transitive Internet English) To label (a message) with a hashtag.

Wikipedia
Hashtag

A hashtag is a type of label or metadata tag used on social network and microblogging services which makes it easier for users to find messages with a specific theme or content. Users create and use hashtags by placing the hash character (or pound sign) # in front of a word or unspaced phrase, either in the main text of a message or at the end. Searching for that hashtag will then present each message that has been tagged with it. A hashtag archive is consequently collected into a single stream under the same hashtag.

For example, on the photo-sharing service Instagram the hashtag #bluesky allows users to find images that have been tagged as containing the blue sky, and #cannes2014 is a popular tag for images from the 2014 Cannes Film Festival. Hashtags can be used to collect public opinion on events and ideas at the local, corporate, or world level. For example, searching Twitter for #worldcup2014 returns many tweets from individuals around the globe about the 2014 FIFA World Cup.

Because of its widespread use, hashtag was added to the Oxford English Dictionary in June 2014. The term hashtag can also refer to the hash symbol itself when used in the context of a hashtag.