Definition of Eocene in English:


Syllabification: E·o·cene
Pronunciation: /ˈēəˌsēn


  • 1Of, relating to, or denoting the second epoch of the Tertiary period, between the Paleocene and Oligocene epochs.
    More example sentences
    • It includes the Palaeocene, Eocene, and Oligocene epochs, spanning the time from the end of the Mesozoic to the beginning of the Neogene.
    • An early Cretaceous to late Eocene volcanic arc was located in the present-day Central Depression.
    • Western Ecuador consists of a complex tectonic melange of oceanic terranes accreted to the continental margin from Late Cretaceous to Eocene time.
  • 1.1 (as noun the Eocene) The Eocene epoch or the system of rocks deposited during it.

The Eocene epoch lasted from 56.5 million to 35.4 million years ago. It was a time of rising temperatures, and there was an abundance of mammals, including the first horses, bats, and whales


mid 19th century: from Greek ēōs 'dawn' + kainos 'new'.

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