Definition of quadrant
1 a : an instrument for measuring altitudes consisting commonly of a graduated arc of 90 degrees with an index or vernier and usually having a plumb line or spirit level for fixing the vertical or horizontal direction b : a device or mechanical part shaped like or suggestive of the quadrant of a circle
2 a : an arc of 90 degrees that is one quarter of a circle b : the area bounded by a quadrant and two radii
3 a : any of the four parts into which a plane is divided by rectangular coordinate axes lying in that plane b : any of the four quarters into which something is divided by two real or imaginary lines that intersect each other at right angles
Examples of quadrant in a sentence
Draw two intersecting lines that divide the page into four quadrants.
The town is located in the northwest quadrant of the state.
Did You Know?
This word is used for a traditional instrument, used to make calculations of altitude and traditionally employed by sailors to navigate, which has a piece shaped like a quarter of a circle. A quadrant shower is a shower that fits snugly into a bathroom corner and displays a curved front, making a quadrant shape on the floor. But perhaps quadrant is used most often today to name a particular quarter of a city.
Origin and Etymology of quadrant
Middle English, from Latin quadrant, quadrans fourth part; akin to Latin quattuor four — more at four
First Known Use: 15th century
QUADRANT Defined for English Language Learners
quadrant
playDefinition of quadrant for English Language Learners

: one part of something that is evenly divided into four parts; especially geometry : one part of a circle that is evenly divided into four parts
QUADRANT Defined for Kids
quadrant
Definition of quadrant for Students
1 : onefourth of a circle
2 : any of the four parts into which something is divided by two imaginary or real lines that intersect each other at right angles
Medical Dictionary
quadrant
playMedical Definition of quadrant
1: an arc of 90° that is one quarter of a circle
2: any of the four more or less equivalent segments into which an anatomic structure may be divided by vertical and horizontal partitioning through its midpoint <pain in the lower right quadrant of the abdomen>
Learn More about quadrant

Spanish Central: Translation of quadrant Nglish: Translation of quadrant for Spanish speakers Britannica.com: Encyclopedia article about quadrant
Seen and Heard
What made you want to look up quadrant? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!