tertiary
/tersh ri/ • adjective 1 third in order or level. 2 chiefly Brit. (of education) at a level beyond that provided by schools. 3 (of medical treatment) provided at a specialist institution. 4 (Tertiary) Geology relating to the first period of the Cenozoic era, about 65 to 1.64 million years ago. — ORIGIN Latin tertiarius ‘of the third part or rank’.
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