# 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 k^{w}etwer- in the Appendix of 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.

See also: Instruments**— quadrantal,***ad].*ThesaurusAntonymsRelated WordsSynonyms

**Legend:**Switch to new thesaurus

Noun | 1. | quadrant - a quarter of the circumference of a circleline - 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 | |

3. | quadrant - the area enclosed by two perpendicular radii of a circle | |

4. | quadrant - a measuring instrument for measuring altitude of heavenly bodiesmeasuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something |

Translations

**kvadrantti**

**kvadrant**

## quadrant

## quad·rant

*n.*cuadrante, cuarta parte de un círculo.

## quadrant

*n*cuadrante

*m*;

**left lower —**cuadrante inferior izquierdo

**right upper —**cuadrante superior derecho

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