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Quadrant 1

Definition: The fourth part; the quarter.

Quadrant 2

Definition: 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.

Quadrant 3

Definition: 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.

Quadrant 4

Definition: 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.

quadrant 5

Definition: a measuring instrument for measuring altitude of heavenly bodies

quadrant 6

Definition: the area enclosed by two perpendicular radii of a circle

quadrant 7

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

quadrant 8

Definition: a quarter of the circumference of a circle

quadrant 9

Definition: a quarter of the circumference of a circle

 

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