extra commerciumglossary / EXTRA COMMERCIUM extra commercium (eks-tr[schwa] k[schwa]-m[schwa]r-shee-[schwa]m). [Latin] Outside commerce. • This phrase was used in Roman and civil law to describe property dedicated to public use and not subject to private ownership. 词条贡献者 资深译员David,毕业于亚洲顶尖的高级翻译学院,擅长翻译有关汽车业的法律文件。