- The definition of a quadrant is a fourth or quarter portion of a circle.
An example of a quadrant is one slice of pie that's been cut into four equal pieces.
Each quadrant contains a different kind of popcorn.Licensed from iStockPhoto
- a fourth part of the circumference of a circle; an arc of 90°
- a quarter section of a circle
- any piece or part shaped like a quarter section of a circle
- an instrument similar to the sextant in design and function, and superseded by it
- Geom. any of the four parts formed by rectangular coordinate axes on a plane surface
Origin: Middle English from Classical Latin quadrans, fourth part from quadrare: see quadrate
- quadrantal adjective
Used by arrangement with John Wiley & Sons, Inc.
- 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.
- A machine part or other mechanical device that is shaped like a quarter circle.
- An early instrument for measuring altitude of celestial bodies, consisting of a 90° graduated arc with a movable radius for measuring angles.
Origin: Middle English, quarter of a day, from Latin quadrāns, quadrant-, a fourth part; see kwetwer- in Indo-European roots.
quadrant - Medical Definition
- 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.
- quadrantic adjective
quadrant - Science Definition
- 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.
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