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

    In French law. The possession, by two or more persons, of equal rights or privileges over the same subject-matter.
    —Concurrence deloyale. A verm of the French law nearly equivalent to "unfair trade competition;" and used in relation to the infringement of rights secured by trade-marks, etc. It signifies a dishonest, perfidious, or treacherous rivalry in trade, or any manoeuvre calculated to prejudice the good will of a business or the value of the name of a property or its credit or renown with the public, to the injury of a business competitor. Simmons Medicine Co. v. Mansfield Drug Co.., 93 Tenn. 84, 23 S. W. 165.