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1. (n.) quadrant
a quarter of a circle; an arc of 90°.
2. quadrant
the area included between such an arc and two radii drawn one to each extremity.
3. quadrant
something shaped like a quarter of a circle, as a part of a machine.
4. quadrant
one of the four parts into which a plane, as the face of a heavenly body, is divided by two perpendicular lines:
the first quadrant of the moon.
5. quadrant
an instrument, usu. containing a graduated arc of 90°, used in astronomy, navigation, etc., for measuring altitudes.
Etymology: (1350–1400; ME < L quadrant-, s. of quadrāns fourth part)
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| Definition of 'quadrant' |
Princeton's WordNet |
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1. (noun) quadrant, quarter-circle
a quarter of the circumference of a circle
2. (noun) quadrant
any of the four areas into which a plane is divided by two orthogonal coordinate axes
3. (noun) quadrant
the area enclosed by two perpendicular radii of a circle
4. (noun) quadrant
a measuring instrument for measuring altitude of heavenly bodies
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| Definition of 'quadrant' |
Webster Dictionary |
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1. (noun) quadrant
the fourth part; the quarter
2. (noun) quadrant
the quarter of a circle, or of the circumference of a circle, an arc of 90¡, or one subtending a right angle at the center.
3. (noun) quadrant
one of the four parts into which a plane is divided by the coordinate axes. The upper right-hand part is the first quadrant; the upper left-hand part the second; the lower left-hand part the third; and the lower right-hand part the fourth quadrant
4. (noun) quadrant
an instrument for measuring altitudes, variously constructed and mounted for different specific uses in astronomy, surveying, gunnery, etc., consisting commonly of a graduated arc of 90¡, with an index or vernier, and either plain or telescopic sights, and usually having a plumb line or spirit level for fixing the vertical or horizontal direction.
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| Definitions of 'quadrant' |
The Nuttall Encyclopedia |
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1. quadrant
an instrument for taking altitudes, consisting of the graduated arc of a circle of ninety degrees.
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| Definition of 'quadrant' |
The Standard Electrical Dictionary |
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1. quadrant
A length equal to an approximate earth quadrant, equal to 1E9 centimeters. It has been used as the name for the unit of inductance, the henry, q. v.
Synonym--Standard Quadrant.
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Definitions of quadrant 
