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Quadrant 1Definition: The fourth part; the quarter.
Quadrant 2Definition: 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.
Quadrant 3Definition: 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.
Quadrant 4Definition: 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
usually having a plumb line or spirit level for fixing the vertical or horizontal direction.
quadrant 5Definition: a measuring instrument for measuring altitude of heavenly bodies
quadrant 6Definition: the area enclosed by two perpendicular radii of a circle
quadrant 7Definition: any of the four areas into which a plane is divided by two orthogonal coordinate axes
quadrant 8Definition: a quarter of the circumference of a circle
quadrant 9Definition: a quarter of the circumference of a circle