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Of, relating to, or being the epoch of geologic time from about 56 to 34 million years ago, the second epoch of the Tertiary Period. It is characterized by warm climates, the rise of most modern mammalian families, and the formation of the Himalayas. See Table at geologic time.
The Eocene Epoch.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Palaeontology) of, denoting, or formed in the second epoch of the Tertiary period, which lasted for 20 000 000 years, during which hooved mammals appeared
(Palaeontology) the Eocene the Eocene epoch or rock series
[C19: from eo- + -cene]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. noting or pertaining to an epoch of the Tertiary Period, occurring from 55 million to 40 million years ago, characterized by the advent of the modern mammalian orders.n.
2. the Eocene Epoch or Series.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
The second epoch of the Tertiary Period, from about 58 to 37 million years ago, characterized by warm climates and the rise of most modern families of mammals. See Chart at geologic time.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.