In French law. The possession, by two or more persons, of equal rights or privileges over the same subject matter. Concurrence deloyale. A term of the French law nearly equivalent to “unfair trade competition;” and used in relation to the infringement of rights secured by trademarks, 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. 8 23 S. W. 165.