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Pliocene

[plahy-uh-seen] /ˈplaɪ əˌsin/
adjective
1.
noting or pertaining to an epoch of the Tertiary Period, occurring from 10 to 2 million years ago, and characterized by increased size and numbers of mammals, by the growth of mountains, and by global climatic cooling.
noun
2.
the Pliocene Epoch or Series.
Origin
1825-1835
1825-35; plio- + -cene
Related forms
post-Pliocene, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Pliocene

Pliocene

/ˈplaɪəʊˌsiːn/
adjective
1.
of, denoting, or formed in the last epoch of the Tertiary period, which lasted for three million years, during which many modern mammals appeared
noun
2.
the Pliocene, the Pliocene epoch or rock series
Word Origin
C19: plio- + -cene, from Greek kainos recent
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for Pliocene
adj.

1833, from plio- "more" (Latinized form of pleio-) + -cene.

Online Etymology Dictionary, © 2010 Douglas Harper
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Pliocene in Science
Pliocene
  (plī'ə-sēn')   
The fifth and last epoch of the Tertiary Period, from about 5 to 2 million years ago. During this time the global climate became cooler and the number and expanse of grasslands and savannas increased greatly. This change in vegetation was accompanied by an increase in long-legged grazers. The land bridge between North America and South America also formed at this time, and massive ice sheets accumulated at the poles. In the later part of the epoch many of the species living in polar regions became extinct. See Chart at geologic time.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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