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Gilbert,国际知名法学院法律翻译专业,擅长翻译各类与复杂知识产权诉讼相关的法律文件。