Hapax

“A hapax is a word that occurs only once within a context, either in the written record of an entire language, in the works of an author, or in a single text. The term is sometimes incorrectly used to describe a word that occurs in just one of an author’s works, even though it occurs more than once in that work. It is a transliteration of Greek ἅπαξ λεγόμενον, meaning ” said only once”

Wikipedia

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