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minister (of government); noble
「大臣」 has another reading with different meanings.
cabinet minister
彼かれは財務ざいむ大臣だいじんに任命にんめいされたんだ。
He was appointed finance minister.
新しいあたらしい大臣だいじんが就任しゅうにんしたらしいよ。
A new minister seems to have taken office.
大臣だいじんとしての責任せきにんは重いおもいと思うおもう。
I think the responsibility as minister is heavy.