Scrabble?! QUADRANT

Definitions of QUADRANT in various dictionaries:

noun - a quarter of the circumference of a circle

noun - any of the four areas into which a plane is divided by two orthogonal coordinate axes

noun - the area enclosed by two perpendicular radii of a circle

noun - a measuring instrument for measuring altitude of heavenly bodies

Mathematics.

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

The plane area bounded by such an arc and two perpendicular radii.

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.

noun - a quarter section of a circle