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rational
noun
(
mathematics
)
a
number
that
can
be
written
as
one
whole
number
divided
by
another
•
Negative
five-thirds
is
a
rational
because
it
equals
−5⁄3
.
Negative
five-thirds
is
a
rational
because
it
equals
−5⁄3
.
•
The
set
of
all
rationals
is
denoted
by
the
letter
ℚ
.
The
set
of
all
rationals
is
denoted
by
the
letter
ℚ
.
Noun
use
developed
from
the
adjective
in
mathematical
contexts
.
