gigayear
megayear
giga-annum
millenary
millennial
millennian
yearthousand
gigalightyear
millenarian
two commas
kilolightyear
megalight-year
billiard
milliard
bimillenary
Age of Reptiles
millennium
Mesozoic era
centimillennium
Mesozoic
k
hundreds of thousands
Cenozoic era
Cenozoic
Age of Mammals
multimillennial
multi-billion
multicentennial
quadrimillennial
C.
yearhundred
thousand million
age
quadrillion
trillionfold
plurisecular
trimillennial
multisecular
centennially
Quaternary period
Quaternary
Age of Man
kya
Holocene epoch
Recent epoch
sextillion
Holocene
yard
Recent
octillion
bicentennial
millesimally
megabillion
decamillennium
centurial
millionary
gigabuck
mega-annum
Paleozoic era
supercenturial
quintillion
Paleozoic
multitrillion
Tertiary
chilia-
millionennium
milli-
Tertiary period
decamillennial
billionfold
Carboniferous
Carboniferous period
millifold
century
bicentennially
octad
long scale
bimillennial
like a million pounds
centennial
eon
Precambrian
dime
short scale
THz
kilobuck
sweat rash
Precambrian eon
terahertz
Precambrian aeon
Precambrian period
prickly heat

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

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