quadrant

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quad·rant

 (kwŏd′rənt)
n.
1. Mathematics
a. A circular arc of 90°; one fourth of the circumference of a circle.
b. The plane area bounded by such an arc and two perpendicular radii.
c. Any of the four areas into which a plane is divided by the reference axes in a Cartesian coordinate system, designated first, second, third, and fourth, counting counterclockwise from the area in which both coordinates are positive.
2. A machine part or other mechanical device that is shaped like a quarter circle.
3. An early instrument for measuring altitude of celestial bodies, consisting of a 90° graduated arc with a movable radius for measuring angles.

[Middle English, quarter of a day, from Latin quadrāns, quadrant-, a fourth part; see kwetwer- in Indo-European roots.]

quadrant

(ˈkwɒdrənt)
n
1. (Mathematics) geometry
a. a quarter of the circumference of a circle
b. the area enclosed by two perpendicular radii of a circle and its circumference
c. any of the four sections into which a plane is divided by two coordinate axes
2. (Mechanical Engineering) a piece of a mechanism in the form of a quarter circle, esp one used as a cam or a gear sector
3. (Astronomy) an instrument formerly used in astronomy and navigation for measuring the altitudes of stars, consisting of a graduated arc of 90° and a sighting mechanism attached to a movable arm
[C14: from Latin quadrāns a quarter]
quadrantal adj

quad•rant

(ˈkwɒd rənt)

n.
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. one of the four parts into which a plane, as the face of a heavenly body, is divided by two perpendicular lines: the first quadrant of the moon.
5. an instrument, usu. containing a graduated arc of 90°, used in astronomy, navigation, etc., for measuring altitudes.
[1350–1400; Middle English < Latin quadrant-, s. of quadrāns fourth part]

quad·rant

(kwŏd′rənt)
1. An arc equal to one quarter of the circumference of a circle; an arc of 90°.
2. Any of the four regions into which a plane is divided by the axes of a Cartesian coordinate system. The quadrants are numbered counterclockwise one through four, beginning with the quadrant in which both the x- and y-coordinates are positive (usually the upper right quadrant).
3. An instrument with an arc of 90°, used to measure the angle between a celestial object and the horizon.

quadrant

- A quarter of a circle or sphere.
See also related terms for sphere.

quadrant

an instrument for measuring angular elevation, used in astronomy, navigation, surveying, etc., similar in principle to the sextant. — quadrantal, ad].
See also: Instruments
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.quadrant - a quarter of the circumference of a circle
line - a spatial location defined by a real or imaginary unidimensional extent
2.quadrant - any of the four areas into which a plane is divided by two orthogonal coordinate axes
area, country - a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography); "it was a mountainous area"; "Bible country"
3.quadrant - the area enclosed by two perpendicular radii of a circle
area, country - a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography); "it was a mountainous area"; "Bible country"
4.quadrant - a measuring instrument for measuring altitude of heavenly bodiesquadrant - a measuring instrument for measuring altitude of heavenly bodies
measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something
Translations
kvadrantti
kvadrant

quadrant

[ˈkwɒdrənt] Ncuadrante m

quadrant

[ˈkwɒdrənt] nquadrant m

quadrant

nQuadrant m

quadrant

[ˈkwɒdrənt] nquadrante m

quad·rant

n. cuadrante, cuarta parte de un círculo.

quadrant

n cuadrante m; left lower — cuadrante inferior izquierdo right upper — cuadrante superior derecho
References in periodicals archive ?
The Treatise on the Division of a Quadrant of a Circle is so-called because of its central problem: how does one divide a circular quadrant into two parts, so that the line segments projected from the dividing point to the perpendicular diameters of the circle form a specific ratio?