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

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

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