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

    The enumeration of one amounts to the exclusion of the other.

  • Black's Law Dictionary: 2nd Edition

    The specification of one thing ls the exclusion of a different thing. A maxim more generally expressed in the form "expressio unius est exclusio alterius," (q. v.)