An ambassador; the top diplomatic representative of one country posted to another.
日本の大使は来週、正式に着任する予定だ。
Japan's ambassador is scheduled to officially take up the post next week.
大使は両国の友好関係を深める役割を担っている。
An ambassador plays a role in deepening friendly relations between the two countries.
彼女は経験豊富で、以前は大使を務めていた。
She is experienced and previously served as an ambassador.