1. from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution; [syn: Pleistocene, Pleistocene epoch, Glacial epoch]
WordNet (r) 3.0 (2006):
Pleistocene epoch
n 1: from two million to 11 thousand years ago; extensive
glaciation of the northern hemisphere; the time of human
evolution [syn: Pleistocene, Pleistocene epoch,
Glacial epoch]