paleocene paleoceanography • Paleocene · · · Info · Definitions · Characters · · paleocene · · Text Latin · · Script 9 · · Length 4 · · Syllables Definitions · · · (noun) from 63 million to 58 million years ago; appearance of birds and earliest mammals. Synonyms: Paleocene, Paleocene epoch. · · Noun Definition 1 Characters · · a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 l latin small letter l U+006C n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070