[plahy-stuh-seen] Geology.
noting or pertaining to the epoch forming the earlier half of the Quaternary Period, beginning about two million years ago and ending 10,000 years ago, characterized by widespread glacial ice and the advent of modern humans. See table under geologic time.
the Pleistocene Epoch or Series.

1830–40; < Greek pleîsto(s) most (superlative of polýs much) + -cene

post-Pleistocene, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Pleistocene (ˈplaɪstəˌsiːn)
1.  of, denoting, or formed in the first epoch of the Quaternary period, which lasted for about 1 600 000 years. It was characterized by extensive glaciations of the N hemisphere and the evolutionary development of man
2.  the Pleistocene the Pleistocene epoch or rock series
[C19: from Greek pleistos most + kainos recent]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"pertaining to the glacial period," 1839, coined by Lyell from Gk. pleistos "most" (superl. of polys "much;" see poly-) + kainos "new" (see recent).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
Pleistocene   (plī'stə-sēn')  Pronunciation Key 
The earlier of the two epochs of the Quaternary Period, from about 2 million to 10,000 years ago. The Pleistocene Epoch was characterized by the formation of widespread glaciers in the Northern Hemisphere and by the appearance of humans. mammals included both small forms, such as saber-toothed tigers and horses and giant ones, such as mammoths and mastodons. Almost all the giant mammals, including woolly mammoths, giant wolves, giant ground sloths, and massive wombats disappeared at the end of the Pleistocene and the start of the Holocene. See Chart at geologic time.
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