hashtag

noun

hash·​tag ˈhash-ˌtag 

plural hashtags

: a word or phrase preceded by the symbol # that classifies or categorizes the accompanying text (such as a tweet)

Using the hashtag #shedeservedthepurse, people are recording themselves hiding money and gift cards in baby staples like diaper boxes and formula containers for moms to find and use to treat themselves.

—Meghan Overdeep

You know a thing is really a thing these days when it has its own hashtag. And there it was last week, trending on Twitter alongside #cincodemayo and #happymothersday: #umpshow, which sprang up in the wake of some shockingly bad umpiring over the first six weeks of the major league season.

—Joe Sheehan

It's also true that a popular hashtag can benefit important and worthy subjects, such as the recently kidnapped Nigerian schoolgirls.

—Mark Leibovich

also : the symbol # as used in a hashtag

Did you know?

Hashtags are an everyday part of Internet culture, thanks to social media. Originally designed for categorizing posts (i.e., tagging them) on Twitter, hashtags now commonly also supplement or comment on whatever text or image they accompany. The “hash” in hashtag is short for hash mark, a term for what we also call a pound sign or, if you want to apply the word-nerdiest designation, an octothorpe. Hash in this case is probably an alteration of hatch, a term for the lines artists sometimes use to add shading to a drawing. #WordNerdery

Examples of hashtag in a Sentence

Recent Examples on the Web

The incident triggered a global social media outcry, with hashtags such as #StandWithMexico and #JusticeForFatima trending internationally, Life & Style reported. —Megan Cartwright, MSNBC Newsweek, 21 Nov. 2025

The actor then poked fun at their search for a new film name by adding the hashtag #NotBodyguardTheMovie. —Lexy Perez, HollywoodReporter, 20 Nov. 2025

The letter and accompanying hashtag took off, prompting Pan Macmillan UK to put their translators more front and center, and other Big Fives pledged to do better, too. —Literary Hub, Literary Hub, 18 Nov. 2025

Post your best photos from the event to Instagram with the hashtag #Aglow502. —Kirby Adams, Louisville Courier Journal, 17 Nov. 2025

Word History

First Known Use

2007, in the meaning defined above

Rhymes for hashtag

• airbag
• handbag
• ragtag
• sandbag
• ag
• bag
• brag
• dag
• drag
• flag
• gag
• hag

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Kids Definition

hashtag

noun

hash·​tag

ˈhash-ˌtag

: a word or phrase preceded by the symbol # that classifies or categorizes the accompanying text (as a tweet)