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quadrant. **1** In analytic geometry, one of the four regions of the plane determined by two lines, the *x-*axis and the *y-*axis. Commonly these lines are drawn perpendicular to each other, and the quadrants, or regions, they determine are numbered counterclockwise, beginning with the upper right quadrant. **2** In geometry, a region of a plane determined by two perpendicular radii of a circle and the circle itself. Thus two perpendicular diameters of a circle divide it into four regions, or quadrants.

The Columbia Electronic Encyclopedia Copyright © 2004.

Licensed from Columbia University Press

Licensed from Columbia University Press

quadrant, in technology, angle-measuring device based on a scale of 90°. It is sometimes confused with the sextant, a similar instrument based on a scale of 60°. The quadrant is rarely used today.

The Columbia Electronic Encyclopedia Copyright © 2004.

Licensed from Columbia University Press

Licensed from Columbia University Press

Quadrant may refer to:

- One of the four sections of the Cartesian coordinate system
- Quadrant (instrument), a measuring instrument capable of measuring angles up to 90°
- In science-fiction: Galactic quadrants (Star Trek)
- HMS Quadrant (G11), a Second World War British/Australian warship
- A Quadrant or section in a city street nomenclature system
- Quadrant (automobile)
- Quadrant (magazine), an Australian journal
- Quadrant Shopping Centre, Swansea, Wales
- First Quebec Conference (1943) (codenamed "QUADRANT")
- A sector equal to one quarter of a circle, or half a semicircle
- Quadrant (architecture) a building which arcs in 90 degree manner

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Last updated on Saturday August 30, 2008 at 21:09:11 PDT (GMT -0700)

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This article is licensed under the GNU Free Documentation License.

Last updated on Saturday August 30, 2008 at 21:09:11 PDT (GMT -0700)

View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation

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