noun
prime minister; premier; chancellor
Formal term for the head of government, often used in historical or official contexts. In modern Japan, 首相 is more common for the current prime minister, while 宰相 can carry a slightly literary or statesmanlike tone.
See also: 首相
彼は若くして宰相の座に就いた。
He assumed the office of prime minister at a young age.
I am researching 19th-century British prime ministers.