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

    Of the same order, rank, degree or authority; concurrent; without any distinction of superiority and inferiority; as, courts of "co-ordinate jurisdiction." See Jurisdiction. Co-ordinate and subordinate are terms often applied as a test to ascertain the doubtful meaning of clauses in an act of parliament. If there be two, one of which is grammatically governed by the other, it is said to be "subordinate" to it; but, if both are equally governed by some third clause, the two are calied "co-ordinate." Wharton.