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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what does quadrant mean

quad·rant

[kwod-ruhnt]

NOUN

1.

a quarter of a circle; an arc of 90°.

2.

the area included between such an arc and two radii drawn one to each extremity.

3.

something shaped like a quarter of a circle, as a part of a machine.

4.

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.

5.

an instrument, usually containing a graduated arc of 90°, used in astronomy, navigation, etc., for measuring altitudes.

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