essential mistakeglossary / essential mistake Contracts. A mistake serious enough that no real consent could have existed, so that there was no real agreement. [Cases: Contracts 93. C.J.S. Contracts §§ 136, 147–148.] 词条贡献者 资深译员Betty,知名法学院国际金融法专业,擅长翻译各类与并购业务相关的法律文件。