元となった辞書の項目
plus-minus sign
noun
(mathematics)
the
symbol
±,
meaning
"plus
or
minus",
used
to
indicate
the
precision
of
an
approximation
(as
in
"The
result
is
10
±
0.3",
meaning
the
result
is
anywhere
in
the
inclusive
range
from
9.7
to
10.3),
or
as
a
convenient
shorthand
for
a
quantity
with
two
possible
values
of
opposing
sign
and
identical
magnitude
(as
in
"The
roots
of
the
equation
x²
-
4
=
0
are
±2").
意味（1）
(mathematics)
the
symbol
±,
meaning
"plus
or
minus",
used
to
indicate
the
precision
of
an
approximation
(as
in
"The
result
is
10
±
0.3",
meaning
the
result
is
anywhere
in
the
inclusive
range
from
9.7
to
10.3),
or
as
a
convenient
shorthand
for
a
quantity
with
two
possible
values
of
opposing
sign
and
identical
magnitude
(as
in
"The
roots
of
the
equation
x²
-
4
=
0
are
±2").
