adjective

1. of, from, by, or to a king, queen, or other sovereign the royal family, a royal edict, the royal allowance
2. having the rank of a sovereign
3. of a kingdom, its government, etc. the royal fleet
4. 1. founded, chartered, or helped by, or under the patronage of, a sovereign the Royal Society
   2. in the service of a sovereign or of the Crown
5. 1. suitable for a sovereign; magnificent, splendid, etc. royal robes
   2. like or characteristic of a sovereign; majestic, stately, etc. a royal bearing
6. unusually large, great, fine, etc.

Etymology: ME roial < OFr < L regalis, regal

noun

1. a large size of paper, 20 by 25 inches (for printing) or 19 by 24 inches (for writing)
2. a small sail set next above a topgallant sail, on a royal mast
3. Informal a member of a royal family