scienter actionglossary / SCIENTER ACTION scienter action. A lawsuit in which the plaintiff must prove that the defendant acted knowingly or knew of the danger — e.g., at common law an action for damage caused by a domestic animal. See SCIENTER. 词条贡献者 资深译员Gwen,毕业于英国顶尖的高级翻译学院,擅长翻译涉及物联网领域的法律文件。