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A Donald Trump supporter holding a poster of Pepe the Frog, a symbol of the alt-right movement, at a campaign event in Bedford, N.H., Sept. 29, 2016. (Jessica Rinaldi/The Boston Globe via Getty Images)

(JTA) What does the alt-right movement have in common with millennial slang words such as smackdown, slay and man bun?

Turns out they are all among the more than300 words or terms added to Dictionary.com.

The online dictionary, which announced the additions on Thursday, defines alt-right as a political movement originating on social media and online forums, composed of a segment of conservatives who support extreme right-wing ideologies, including white nationalism and anti-Semitism (often used attributively).

It lists the word as having been coined in 2010 by Richard Spencer, a prominent white nationalist, and as being a shortened version of the words alternative and right.

Spencer, a vocal supporter of President Donald Trump, has used a Nazi term Lgenpresse, or lying press to describe the mainstream media, and suggested that the media have been critical of Trump in order to protect Jewish interests.

Other politics-related words and phrases added to Dictionary.com include Black Lives Matter, an activist movement protesting violence and racism against African-Americans; burkini, the full-coverage Islamic bathing suit that was at the center of a controversial ban in France, and clicktivism, the use of social media to express support for various causes.

Dictionary.com isnt the only word reference tool that lists alt-right.The phrase was on the Oxford Dictionarys shortlist for top words in 2016, although ultimately post-truth was declared the international word of the year.

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'Alt-right' added as official term on Dictionary.com - Jewish Telegraphic Agency