Breadcrumb Home > Thesaurus > E Synonyms of eocene Find synonyms for: Noun 1. Eocene, Eocene epoch usage: from 58 million to 40 million years ago; presence of modern mammals WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of eocene (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: pecuniary Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language