Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
  • Ballentine's Law Dictionary

    In the nature of things.

  • Black's Law Dictionary: 2nd Edition

    In the nature of things; in the realm of actuality; in existence. In a dilatory plea, an allegation that the plaintiff is not in rerum natura is equivalent to averring that the person named is fictitious. 3 Bl. Comm. 301. In the civil law the phrase is applied to things. Inst. 2, 20, 7.