debt instrumentglossary / DEBT INSTRUMENT debt instrument. A written promise to repay a debt, such as a promissory note, bill, bond, or commercial paper. [Cases: Bills and Notes 28. C.J.S. Bills and Notes; Letters of Credit§§ 2–3, 7–9, 12, 22, 75.] 词条贡献者 双语律师Denise,知名法学院国际私法专业,擅长翻译各类与国际争议解决相关的法律文件。