oligocene in English
- Oligocene⇄adj. of this epoch or these rocks.
- Oligocene⇄noun 1. the third epoch of the Tertiary period of the Cenozoic era, after the Eocene and before the Miocene, during which the first apes appeared and modern mammals became dominant.
2. the series of rocks formed in this epoch. - Oligocene⇄Oligocene, noun, adjective.