noun which may take the genitive case particle 'no', noun
authorized by imperial or royal order; appointed by the emperor
Used in historical contexts for laws, books, or officials sanctioned directly by an emperor or monarch. Modern equivalents would use terms like 勅定 or 勅命.
欽定憲法は君主が制定する憲法の一形態である。
A constitution by imperial decree is a form of constitution enacted by a monarch.