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rational
adjective
using
clear
and
logical
thinking
rather
than
emotion
or
guesswork
•
Mia
stayed
rational
while
everyone
else
panicked
during
the
fire
drill
.
Mia
stayed
rational
while
everyone
else
panicked
during
the
fire
drill
.
•
After
a
night
’
s
sleep
,
Luis
made
a
more
rational
decision
about
quitting
his
job
.
After
a
night
’
s
sleep
,
Luis
made
a
more
rational
decision
about
quitting
his
job
.
Late
Middle
English
,
from
Latin
rationalis
‘
reasoning
’,
from
ratio
‘
reason
’.
adjective
(
mathematics
)
able
to
be
expressed
as
the
ratio
of
two
whole
numbers
•
Three-quarters
is
a
rational
number
because
it
equals
3⁄4
.
Three-quarters
is
a
rational
number
because
it
equals
3⁄4
.
•
The
square
root
of
two
is
not
rational
.
The
square
root
of
two
is
not
rational
.
Extended
mathematical
sense
recorded
from
the
17th
century
.
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
.