1. from 13 million to 2 million years ago; growth of mountains; cooling of climate; more and larger mammals; [syn: Pliocene, Pliocene epoch]
WordNet (r) 3.0 (2006):
Pliocene epoch
n 1: from 13 million to 2 million years ago; growth of
mountains; cooling of climate; more and larger mammals
[syn: Pliocene, Pliocene epoch]