Etymology
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Paleocene (adj.)

in reference to the geological epoch preceding the Eocene, 1874, from French paléocène, coined 1874 by French paleobotanist Wilhelm Philippe Schimper from paleo- + Latinized form of Greek kainos "new" (see recent), on model of earlier Miocene, Eocene, etc. It is, thus, the "old new" age.

updated on January 24, 2020

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Definitions of Paleocene from WordNet

Paleocene (n.)
from 63 million to 58 million years ago; appearance of birds and earliest mammals;
Synonyms: Paleocene epoch
From wordnet.princeton.edu, not affiliated with etymonline.