Meaning & use
Eocene
A geologic epoch lasting from about 56 to 34 million years ago, marked by the rise of early mammals.
See it in a sentence
Fossils from the Eocene show some of the earliest known ancestors of modern horses.
The climate during the Eocene was much warmer than it is today.
A note on using this word
The Eocene is the second epoch of the Paleogene period, following the Paleocene and preceding the Oligocene.
Words with a similar meaning
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