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