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Definition of Eocene
1. Noun. From 58 million to 40 million years ago; presence of modern mammals.
Definition of Eocene
1. a. 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.
Definition of Eocene
1. Adjective. (geology) of a geologic epoch within the Paleogene period from about 56 to 34 million years ago. ¹
2. Noun. (geology) the Eocene epoch ¹
¹ Source: wiktionary.com
Definition of Eocene
1. of or pertaining to a certain geologic time period [adj]
Medical Definition of Eocene
1.