sole prerogative; exclusive prerogative
Refers to a matter or right that belongs exclusively to a particular person, group, or authority, often used in legal, political, or organizational contexts.
Foreign policy is considered the sole prerogative of the president.
Personnel authority is the exclusive prerogative of the company president.
Compound of 専権 (exclusive authority) and 事項 (matter, item). The exact historical derivation is uncertain, but the term is used in modern formal contexts.