Meaning

adjective of or relating to or indicative of or issued or performed by a king or queen or other monarch

noun a sail set next above the topgallant on a royal mast

adjective established or chartered or authorized by royalty

originFrom Middle English royal, from Old French roial (Modern French royal), from Latin rēgālis, from rēx (“king”). Doublet of regal (“befitting a king”), real (“unit of currency”), ariary, and riyal. Cognate with Spanish real, Italian reale, Catalan reial. Displaced native Old English cynelīċ.

Etymology from Wiktionary, CC BY-SA 3.0