megayear
gigayear
millenary
millennial
yearthousand
millennian
millenarian
millennium
bimillenary
centennially
k
yearhundred
C.
kya
giga-annum
two commas
age
Cenozoic
Age of Reptiles
Mesozoic era
Cenozoic era
Mesozoic
centimillennium
Age of Mammals
multicentennial
megalight-year
millesimally
centennial
bicentennial
quadrimillennial
trimillennial
kilolightyear
Tertiary period
Tertiary
centurial
multimillennial
plurisecular
multisecular
bicentennially
century
Quaternary period
100s
chilia-
hundreds of thousands
Age of Man
milli-
Quaternary
decamillennium
Recent epoch
Holocene
Holocene epoch
Recent
quadrillion
bimillennial
decades young
era
billiard
gigalightyear
cental
decamillennial
supercenturial
hundo
hundred-thousandth
intercentennial
eon
Carboniferous period
short scale
millesimal
centuriate
chiliad
milliard
Carboniferous
submillennial
multi-billion
yard
great hundred
millifold
octad
century year
centenary
hecto-
millionary
billion
intersecular
secular
billionfold
centi-
long scale
Paleozoic era
Old Hundred
Paleolithic
Paleozoic

English words for 'A million years, a thousand thousand years.'

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