What does "quadrant" mean?


The term quadrant refers to an arc equal to one quarter of the circumference of a circle. It also refers to an instrument for measuring altitudes consisting commonly of a graduated arc of 90 degrees with an index having a plumb line for fixing the vertical or horizontal direction. The other meaning of quadrant is any of the four areas into which a plane is divided by two orthogonal coordinate axes.
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Ask.com Answer for: what does quadrant mean
a quarter of a circle; an arc of 90°.
the area included between such an arc and two radii drawn one to each extremity.
something shaped like a quarter of a circle, as a part of a machine.
Geometry, Astronomy one of the four parts into which a plane, as the face of a heavenly body, is divided by two perpendicular lines, numbered counterclockwise from upper right: the first quadrant of the moon.
an instrument, usually containing a graduated arc of 90°, used in astronomy, navigation, etc., for measuring altitudes.
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