Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of oligocene is as below...

Oligocene :: Oligocene (a.) Of, pertaining to, or designating, certain strata which occupy an intermediate position between the Eocene and Miocene periods..

Oligocene :: Oligocene (n.) The Oligocene period. See the Chart of Geology.

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