Definitions for "NEOGENE"
A time interval of the Cenozoic era, lasting from 23.7 to 1.6 Ma and incorporating the Miocene and Pliocene epochs. If the Tertiary is designated as an era, then the Neogene and the Paleogene are its two periods.
The Neogene period is the interval of geological time from 24 to 1.8 million years ago. Neogene is derived from the Greek word for recent.
A period of geological time, dating from about 25 to 2 million years ago.