one day

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one day

  1. (set phrase) At some unspecified time in the future.
    One day I shall upgrade my software, but not just yet.
    Synonyms: one of these days, someday; see also Thesaurus:one day
  2. At some unspecified time in the past.
    One day I was playing with a girl from my class.
    Synonym: once
    • 1913, Joseph C. Lincoln, chapter 11, in Mr. Pratt's Patients:
      One day I was out in the barn and he drifted in. I was currying the horse and he set down on the wheelbarrow and begun to ask questions.
  3. Used other than figuratively or idiomatically: see one,‎ day.
    You can stay one day or two.