As a Noun:
1. A member of a royal family who reigns over a country. English = monarch, sovereign.
2. A male member of a royal family who reigns over a country. English = king.
3. A female member of a royal family who reigns over a country. English = queen.
4. Members of a royal family. English = royalty.
As a Verb or Adjective:
1. To belong to or relate to a royal family. English = (be) royal.