• synonyms


  1. next after the thirtieth; being the ordinal number for 31.
  2. being one of 31 equal parts.
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  1. a thirty-first part, especially of one (1/31).
  2. the thirty-first member of a series.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for thirty-first

Historical Examples

  • Howe's reinforcements had reported for duty by the thirty-first of December.

    The Bay State Monthly, Vol. 1, Issue 1.


  • This beautiful volume is printed from the thirty-first London edition.

  • Lastly, Mr. Onions Winter was advertising the thirty-first thousand of that work.

    A Great Man

    Arnold Bennett

  • “The thirty-first of December at half-past eight,” explained Betty.

    Betty Wales Senior

    Margaret Warde

  • The Thirty-first held its ground; but yielding was only a question of time.

    From Fort Henry to Corinth

    Manning Ferguson Force