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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.

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"quadrant (in analytic geometry)." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

"quadrant (in analytic geometry)." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (December 14, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/quadrant-analytic-geometry

"quadrant (in analytic geometry)." The Columbia Encyclopedia, 6th ed.. . Retrieved December 14, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/quadrant-analytic-geometry

quadrant †fourth part, quarter, now only of a quarter-circle; instrument (of the form of a graduated quarter-circle) used for making angular measurements. XIV. — L. quadrāns, -ant- quarter, orig. of the as; see QUADRI-.

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"quadrant." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 14 Dec. 2017 <http://www.encyclopedia.com>.

"quadrant." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (December 14, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/quadrant-1

"quadrant." The Concise Oxford Dictionary of English Etymology. . Retrieved December 14, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/quadrant-1

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.