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Meaning of hapax legomenon

hap•ax le•go•me•non

Pronunciation: (hap'aks li-gom'u-non", hā'paks), [key]
— pl. hap•ax le•go•me•na
  1. a word or phrase that appears only once in a manuscript, document, or particular area of literature.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.