1. • 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
2. • 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.
3. • n - a quarter section of a circle

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