tertiary
adj
third in order, rank, importance, etc; next after secondary 第三等的; 第三位的; 第三的
the Tertiary period, ie (in geology) the third stage in the formation of rocks (地質學上巖石形成的)第三紀
tertiary education, ie at university or college level 高等教育
tertiary (ie very severe) burns 三度燒傷(極嚴重的).