Dictionary/密約みつやくMitsuyaku密約 (Mitsuyaku) is a Japanese noun meaning “secret agreement”.Meaningsnoun, suru verb, transitive verbsecret agreementKanji in 密約密secrecy約promiseRelated words約束promise秘密secret契約contract要約summary約approximately予約reservation婚約者fiance紐育New York密室locked room婚約engagement密かsecret契約書(written) contract