QUADRANT
\kwˈɒdɹənt], \kwˈɒdɹənt], \k_w_ˈɒ_d_ɹ_ə_n_t]\
Definitions of QUADRANT
 2006  WordNet 3.0
 2011  English Dictionary Database
 2010  New Age Dictionary Database
 1913  Webster's Revised Unabridged Dictionary
 1919  The Winston Simplified Dictionary
 1899  The american dictionary of the english language.
 1894  The Clarendon dictionary
 1919  The Concise Standard Dictionary of the English Language
 1914  Nuttall's Standard dictionary of the English language
 1874  Etymological and pronouncing dictionary of the English language
 1916  Appleton's medical dictionary
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the area enclosed by two perpendicular radii of a circle

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

a quarter of the circumference of a circle
By Princeton University

the area enclosed by two perpendicular radii of a circle

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

a quarter of the circumference of a circle
By DataStellar Co., Ltd

The fourth part; the quarter.

The quarter of a circle, or of the circumference of a circle, an arc of 90Â¡, or one subtending a right angle at the center.

One of the four parts into which a plane is divided by the coordinate axes. The upper righthand part is the first quadrant; the upper lefthand part the second; the lower lefthand part the third; and the lower righthand part the fourth 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 90Â¡, 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.
By Oddity Software

The fourth part; the quarter.

The quarter of a circle, or of the circumference of a circle, an arc of 90Â¡, or one subtending a right angle at the center.

One of the four parts into which a plane is divided by the coordinate axes. The upper righthand part is the first quadrant; the upper lefthand part the second; the lower lefthand part the third; and the lower righthand part the fourth quadrant.
By Noah Webster.

Onefourth of a circle, or an arc of 90 degrees; an instrument for measuring heights; an instrument for raising a cannon to the height needed for the desired range.
By William Dodge Lewis, Edgar Arthur Singer

(geom.) The fourth part of a circle, or an arc of 90Â°: an instrument consisting of the quadrant of a circle graduated in degrees, used for taking altitudes.
By Daniel Lyons
By William Hand Browne, Samuel Stehman Haldeman
By James Champlin Fernald

The quarter of a circle, or an arc of 90; an instrument for taking altitudes; an instrument used for elevating cannon. Quadrant of altitude, a thin pliable strip of brass belonging to an artificial globe.
By Nuttall, P.Austin.