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Use "hapax" in a sentence
"The term hapax legomenon), and could mean a lost species of tree, an antediluvian composite, or a lost art of producing wood for shipbuilding."
"In fact, the phrase pledge allegiance is what linguists call a hapax legomenon, or hapax for short an expression that only occurs in a single place in the language, like wardrobe malfunction, Corinthian leather, or satisfactual."
"A hapax was a word that only ever appeared once - in a language or a body of writing."