phanerozoic eon phanerozoic aeon • phanerozonate · · · Info · Definitions · Characters · · phanerozoic eon · · Text Common · · Latin · · Scripts 15 · · Length 7 · · Syllables Definitions · · · (noun) the period from about 5,400 million years ago until the present. Synonyms: Phanerozoic, Phanerozoic eon, Phanerozoic aeon. · · Noun Definition 1 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 h latin small letter h U+0068 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 z latin small letter z U+007A