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n. Computers
A searchable keyword or sequence of characters prefixed with the pound sign (#), included in a tweet or other electronic communication and indicating the subject matter.

[hash + tag.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Communications & Information) (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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Moreover, although the Twitter hashtag was born as a categorization method, besides serving as metadata (namely, what the tweet is about), hashtags are now used in a number of ways and for a number of purposes, very often as a contextual aside to comment on, give more depth to, or somehow emphasize what has been said, as in:
Hashtag Hotels has 17 sites across the country and members of staff were emailed yesterday being told they were being made redundant.
Belfast is among the mostsnapped cities in the UK on the photo-sharing site, with a hashtag rate of 2.8 million.
Summary: New Delhi (India), Aug 23 (ANI): Happy Birthday hashtag! Micro-blogging site Twitter is celebrating the 12th birthday of the hashtag on Friday and to mark the occasion the platform launched an emoji to celebrate the symbol that connects communities and unifies conversations.
Summary: 'Animal welfare' post appears when you search for facility's hashtag
The man, whose twitter username is 'Asad' and his twitter handle 'PAkDefender' tweeted the trending hashtag without any additional comment, even as the picture General Musharraf remained his display picture.
Hashtag #UU1/4aeaaU*U[logical not]_U*aaU[degrees]U1/4U*U _auae_U*aaU1/4UU*U*U [Hijab prisoners in Algeria] has been flooding social media feed among Algerians for the past few days.
Muscat: A hashtag campaign on social media is being used by citizens and residents alike to share their love for His Majesty Sultan Qaboos Bin Said and for Oman, for the 48th National Day this year.
Critique: The collaborative work of Susan Allan and Scott Feschuk, "Baby's First Hashtag", although in the format of a classic board book, is not really for babies--although they will still find the glossy cardboard pages a satisfying chew!
The fraudsters have hijacked the #ikokaziKE hashtag on Twitter where they are duping job seekers.
Like any maturing tween, the 11-year-old hashtag is undergoing a series of changes.
The Guinness World Records recognized the love team of Alden Richards and Maine Mendoza, also known as Yaya Dub, on Hashtag Day on Thursday.