Definitions

1. adjective

of or relating to the Neogene period, a geologic epoch spanning from about 23 to 2.6 million years ago.

“The team of paleontologists studied the neogaean fossils discovered in the excavation site.”

2. noun

a geologic epoch or time period.

“The neogaean is a significant part of Earth’s geologic history, marking the end of the Paleogene period.”