tertiaglossary / TERTIA tertia (t[schwa]r-shee-[schwa]), n. Hist. A third. • A widow’s terce was usu. referred to as tertia rationabilis (“a reasonable third”). 词条贡献者 专业法律翻译郭敏,毕业于欧洲顶尖的高级翻译学院,专注翻译各类与复杂保险交易有关的法律文件。