noun, noun which may take the genitive case particle 'no'
Refers to a diplomatic ambassador representing a country. Can also be used attributively with の to modify other nouns (e.g., 大使館 'embassy').
He was posted to France as the Japanese ambassador.
大使館でビザを申請した。
I applied for a visa at the embassy.
The government dispatched a new ambassador to that country.
He was appointed ambassador to the United States.
He held talks with the French ambassador stationed in Japan.
大使 means ambassador, a diplomatic post representing a country abroad, while 大臣 is a cabinet minister running a government ministry at home.
大使 is an ambassador representing the country to a foreign government, while 総領事 only heads a consulate general handling local affairs.
UN ambassador
ambassador's official residence