# quadrant

[ kwod-ruh nt ]

/ ˈkwɒd rənt /

### noun

## RELATED WORDS

term, portion, part, fourth, division, span, section, semester, quad, farthing, quartern, quadrangle, quadruplet, quadraphonic

## Nearby words

- quadragesima,
- quadragesimal,
- quadrangle,
- quadrangular,
- quadrans,
- quadrantal,
- quadrantal corrector,
- quadrantes,
- quadrantic hemianopsia,
- quadrantid

## Origin of quadrant

1350–1400; Middle English < Latin quadrant- (stem of quadrāns) fourth part

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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

## Examples from the Web for quadrant

## quadrant

/ (ˈkwɒdrənt) /

### noun

geometry

- a quarter of the circumference of a circle
- the area enclosed by two perpendicular radii of a circle and its circumference
- any of the four sections into which a plane is divided by two coordinate axes

a piece of a mechanism in the form of a quarter circle, esp one used as a cam or a gear sector

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

## Word Origin for quadrant

C14: from Latin quadrāns a quarter

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## quadrant

late 14c., "a quarter of a day, six hours," from Middle French quadrant, from Latin quadrantem (nominative quadrans) "fourth part," also the name of a coin worth a quarter of an as, noun use of present participle of quadrare "to make square; put in order, arrange, complete; run parallel, be exact," figuratively "to fit, suit, be proper," related to quadrus "a square," quattuor "four" (see four). The surveying instrument is first so called c.1400, because it forms a quarter circle. Related: Quadrantal.

Online Etymology Dictionary, © 2010 Douglas Harper

## quadrant

[ kwŏd′rənt ]

### n.

A circular arc of 90 degrees; one fourth of the circumference of a circle.

A quarter portion of any roughly circular anatomical area such as the abdomen, measuring along imaginary axes at right angles to each other.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

## quadrant

[ kwŏd′rənt ]

An arc equal to one quarter of the circumference of a circle; an arc of 90°.

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).

A navigational instrument similar to a sextant but with an arc of 90° rather than 60°. See more at sextant.

The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.