eon
millennium
centimillennium
Quaternary
Quaternary period
Age of Man
kiloday
age
Archaeozoic
millenary
millennian
millennial
Tertiary period
Tertiary
plurisecular
multisecular
multimillennial
centennial
intersecular
Recent
Holocene
Recent epoch
Holocene epoch
quincentennium
kya
Carboniferous
recent
Paleozoic
Paleoproterozoic
Carboniferous period
Paleozoic era
centurial
decamillennium
multi-billion
bimillennial
submillennial
megayear
Mesozoic era
Mesozoic
Age of Reptiles
century
yearthousand
tertiary
period
quadrimillennial
supercenturial
Ypresian
Paleolithic
billennial
gigayear
Tonian
Oligocene
giga-annum
Cenozoic
neros
Cenozoic era
multicentennial
Age of Mammals
Jurassic period
Jurassic
centuried
Eoarchean
Neoarchean
Cryogenian
Phanerozoic aeon
turn of the century
bimillenary
Phanerozoic eon
Hadean
Phanerozoic
Eocene
era-specific
anthropocenic
era
millionennium
Copernican
Proterozoic
Epipaleolithic
Ediacaran
prehistory
Mesolithic
Mesolithic Age
1530s
Middle Stone Age
Cisuralian
pralaya
Calymmian
synchronology
Permian period
intercentennial
Dark Ages
Permian
quadringentenary
Neolithic Age
Neolithic

English words for 'A period of 1,000,000,000 years.'

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