1. (in England)
a. a title used prior to 1917 and designating a brother, sister, child, grandchild, aunt, or uncle belonging to the male line of the royal family.
b. a title used since 1917 and designating a child or grandchild of the sovereign.
c. any person given this title by the Crown.
2. (in other countries) a person who is a member of a royal family.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.