
the
area
enclosed
by
two
perpendicular
radii
of
a
circle

any
of
the
four
areas
into
which
a
plane
is
divided
by
two
orthogonal
coordinate
axes

a
quarter
of
the
circumference
of
a
circle

The
fourth
part;
the
quarter.

The
quarter
of
a
circle,
or
of
the
circumference
of
a
circle,
an
arc
of
90¡,
or
one
subtending
a
right
angle
at
the
center.

One
of
the
four
parts
into
which
a
plane
is
divided
by
the
coordinate
axes.
The
upper
right
hand
part
is
the
first
quadrant;
the
upper
left
hand
part
the
second;
the
lower
left
hand
part
the
third;
and
the
lower
right
hand
part
the
fourth
quadrant.

An
instrument
for
measuring
altitudes,
variously
constructed
and
mounted
for
different
specific
uses
in
astronomy,
surveying,
gunnery,
etc.,
consisting
commonly
of
a
graduated
arc
of
90¡,
with
an
index
or
vernier,
and
either
plain
or
telescopic
sights,
and
usually
having
a
plumb
line
or
spirit
level
for
fixing
the
vertical
or
horizontal
direction.

One
fourth
of
a
circle,
or
an
arc
of
90
degrees;
an
instrument
for
measuring
heights;
an
instrument
for
raising
a
cannon
to
the
height
needed
for
the
desired
range.

(
geom.)
The
fourth
part
of
a
circle,
or
an
arc
of
90°:
an
instrument
consisting
of
the
quadrant
of
a
circle
graduated
in
degrees,
used
for
taking
altitudes.

Quarter
of
a
circle;
arc
of
90°;
instrument
for
taking
altitudes.

The
quarter
of
a
circle,
or
of
its
circumference.

The
quarter
of
a
circle,
or
an
arc
of
90;
an
instrument
for
taking
altitudes;
an
instrument
used
for
elevating
cannon.
Quadrant
of
altitude,
a
thin
pliable
strip
of
brass
belonging
to
an
artificial
globe.

In
geom.,
the
quarter
of
a
circle;
an
arc
of
90°;
in
nav.
and
astron.,
an
instr.
for
taking
elevations,
adapted
for
measuring
an
arc
of
not
more
than
90°.

Quadrantal.
X