Hapax legomenon
WordNet

noun


(1)   A word with a special meaning used for a special occasion
WiktionaryText

Etymology


From .

Noun



  1. A word occurring only once in a given corpus.
    • 2000, Steven Pinker, Words and Rules ISBN 0-465-07269-0, page 172
      There is a lovely technical term for a word that appears once in a body of text: a hapax legomenon (plural: hapax legomena), Greek for “once said.” The term comes from philology, the study of old texts.

Usage notes


The corpus in question is generally implied by context. Commonly it will be one of:
  • A known corpus of a given language
  • The works of a given author
  • A particular work
  • A book of the Bible
 
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