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 译员Roger,毕业于欧洲一流的高级翻译学院,专注翻译各种与公共及基础设施融资有关的法律文件。