regulationn.1. The act of regulating, or the state of being regulated.()The temper and regulation of our own minds. (Macaulay.)2. A rule or order prescribed for management or government; prescription; a regulating principle; a governing direction; precept; law; as, the regulations of a society or a school.()Regulation sword, cap, uniform, etc. (Mil.), a sword, cap, uniform, etc., of the kind or quality prescribed by the official regulations.()()