adj. 1.of or relating to or indicative of or issued or performed by a king or queen or other monarch 2.established or chartered or authorized by royalty 3.being of the rank of a monarch 4.belonging to or befitting a supreme ruler 5.invested with royal power as symbolized by a crown royal n. 1.a sail set next above the topgallant on a royal mast 2.stag with antlers of 12 or more branches