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nychthemeron noun

  /nɪkˈθi.mə.ɹɑn/ , /nɪkˈθɛ.mɪ.ɹɒn/ , /nɪkˈθɛm.ə.ɹɒn/ , /nɪkˈθɛməɹɑn/
  • (uncommon) A period of one day and one night, a date: in the West, a period of 24 consecutive hours.
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