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trillion
noun
the
number
1
,
000
,
000
,
000
,
000
(
one
million
million
);
written
as
10¹²
•
The
national
debt
reached
over
a
trillion
dollars
last
year
.
The
national
debt
reached
over
a
trillion
dollars
last
year
.
•
Astronomers
estimate
there
are
about
two
trillion
galaxies
in
the
observable
universe
.
Astronomers
estimate
there
are
about
two
trillion
galaxies
in
the
observable
universe
.
from
French
‘
trillion
’,
modelled
on
‘
million
’,
originally
meaning
10¹⁸
but
later
adopted
in
American
usage
for
10¹²
noun
(
dated
British
long
scale
)
the
number
1
,
000
,
000
,
000
,
000
,
000
,
000
(
one
million
million
million
);
written
as
10¹⁸
•
The
19th-century
math
textbook
defines
a
trillion
as
one
million
million
million
.
The
19th-century
math
textbook
defines
a
trillion
as
one
million
million
million
.
•
The
professor
wrote
a
1
followed
by
18
zeros
on
the
chalkboard
to
illustrate
a
British
trillion
.
The
professor
wrote
a
1
followed
by
18
zeros
on
the
chalkboard
to
illustrate
a
British
trillion
.
earlier
British
use
followed
the
French
long-scale
system
,
where
‘
trillion
’
was
10¹⁸
;
Britain
officially
adopted
the
short
scale
(
10¹²
)
in
1974
