"(A) word which occurs only once in the written record of a language, in the works of an author, or in a single text. If a word is used twice it is a dis legomenon, thrice, a tris legomenon. Beyond tetrakis legomenon (four times), there is no term for such a word."
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Hapax legomenon - Wikipedia, the free encyclopedia
One of those great vocabulary discoveries that continues to arrive after age 30. I love such words.
