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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 Eo·cene /ˈiəˌsin/
 始新世,第三紀下層(a.)始新世的,第三紀下層的

From: Webster's Revised Unabridged Dictionary (1913)

 E·o·cene a.  Geol. Pertaining to the first in time of the three subdivisions into which the Tertiary formation is divided by geologists, and alluding to the approximation in its life to that of the present era; as, Eocene deposits. -- n. The Eocene formation.
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From: WordNet (r) 2.0

 Eocene
      n : from 58 million to 40 million years ago; presence of modern
          mammals [syn: Eocene epoch]