immemorial usageglossary / immemorial usage A usage that has existed for a very long time; long-standing custom. See TIME IMMEMORIAL. [Cases: Customs and Usages 1. C.J.S. Customs and Usages § 1.] 词条贡献者 双语律师Jenna,国际知名法学院环境法专业,擅长翻译各类与环境、社会及管治 (ESG)相关的法律文件。