royal

adjective

• having the status of a king or queen or a member of their family:contributors included members of the royal family
• belonging to or carried out or exercised by a king or queen:the royal palace the coalition obtained royal approval for the appointment
• [attributive] in the service or under the patronage of a king or queen:a royal maid
• [attributive] of a quality or size suitable for a king or queen; splendid:a royal fortune
• informal unmitigated; extreme:he might turn out to be a royal pain

noun

• 1 informal a member of a royal family, especially in England.

• 2short for royal sail or royal mast.

• 3 (in full metric royal) a paper size, now standardized at 636 × 480 mm.
• (in full royal octavo) a book size, now standardized at 234 × 156 mm.
• (in full royal quarto) a book size, now standardized at 312 × 237 mm.