Tertiary: adj. and name (word coming from the Latin tertiarius “of a third”, from tertius “third”, on the model of primary).
The adjective "tertiary" has several meanings:
I) Adjective:
1. Geology: Tertiary era, or substantive: the tertiary: geological era (approximately 70 million years) which succeeded the secondary era (Cenozoic).
Alpine folding dating from the Tertiary.
By extension: From the tertiary era.
Tertiary land.
The tertiary fauna is characterized by the ab...
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