Hapax legomenon

noun (pl. hapax legomena or hapaxes)

A word that appears only once in a text corpus or body of writing—be this a particular author's oeuvre, a work of substantial length, or a language's entire collection of writing, including the Twittersphere.

From Ancient Greek hápax legómenon ("thing once said").
The old Ottoman Governments regarded this clan of manticratic peers with a mixture of reverence and distrust.
—T. E. Lawrence, 1926

Despite the constant negative press covfefe
—Donald Trump producing a hapax legomenon of his own, 2017
by DrSJohnson January 30, 2020
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