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that is (to say); namely; i.e.
precisely; exactly; just; nothing but; neither more nor less
(and) then
彼は即ち、私の恩師なんだよ。
He is, namely, my mentor.
結論、即ち答えを言いましょう。
Let me state the conclusion, namely the answer.
問題、即ち課題は何かを考えよう。
Let's think about the problem, namely the issue.