Dictionary/誓約せいやくSeiyaku誓約 (Seiyaku) is a Japanese noun meaning “oath, vow, pledge, covenant”.Meaningsnoun, suru verb, transitive verboath; vow; pledge; covenantKanji in 誓約誓vow約promiseRelated words約束promise契約contract要約summary約approximately予約reservation誓うto swear婚約者fiance紐育New York婚約engagement契約書(written) contract節約economising誓ってsurely