Paleocene paleoceanography • paleochorology · · · Info · Definitions · Characters · · Paleocene · · Text Latin · · Script 9 · · Length Definitions · · · (noun) from 63 million to 58 million years ago; appearance of birds and earliest mammals. Synonyms: Paleocene epoch. · · Noun Definition 1 Characters · · P latin capital letter p U+0050 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