prerogative
/prɪˈrɔgətɪv; prɪ`rɑɡətɪv/ n
right or privilege, esp one belonging to a particular person or group 权利; （尤指）特权
It is the Prime Minister's prerogative to decide when to call an election. 决定大选的日期是首相的职权.
A monarch has the prerogative of pardoning criminals. 君主享有对罪犯的赦免权.
the,royal prerogative, ie (in Britain), the (theoretical) right of the sovereign to act without the approval of Parliament 皇家的特权（在英国, 指国君名义上享有的不经议会认可而采取行动的权利）.