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quadrant

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

The Oxford Companion to Ships and the Sea | 2006 | Â© The Oxford Companion to Ships and the Sea 2006, originally published by Oxford University Press 2006. (Hide copyright information) Copyright

quadrant, from Latin quadrans, the fourth part. (1) The name given to a variety of nautical astronomical instruments. See cross-staff; davis's quadrant; hadley's reflecting quadrant; quintant; seaman's quadrant. (2) The quarter of a circle, used particularly in relation to the magnetic compass card graduated in degrees instead of points. (3) A fitting on a ship's rudder which received the steering wires.

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The Concise Oxford Dictionary of English Etymology | 1996 | | Â© The Concise Oxford Dictionary of English Etymology 1996, originally published by Oxford University Press 1996. (Hide copyright information) Copyright

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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T. F. HOAD. "quadrant." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 12 Nov. 2009 <http://www.encyclopedia.com>.

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T. F. HOAD. "quadrant." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved November 12, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-quadrant.html

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