quadrant

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Holding attitudes in this quadrant is a life-threatening condition.

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Definitions (38)

Toggle American Heritage definitions American Heritage Dictionary (5)

  1. noun Mathematics A circular arc of 90°; one fourth of the circumference of a circle.
  2. noun Mathematics The plane area bounded by such an arc and two perpendicular radii.
  3. noun Mathematics 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.
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Etymologies (3)

Toggle American Heritage etymologies American Heritage Dictionary (1)

  1. Middle English, quarter of a day, from Latin quadrāns, quadrant-, a fourth part; see kwetwer- in Indo-European roots.

Toggle Century etymologies Century Dictionary (2)

  1. from Middle English quadrant, from Anglo-French quadrant, a farthing, Old French quadrant, a Roman coin (quadrans), also quadran, cadran, a sun-dial, French cadran, a sun-dial, dial, = Spanish cuadrante = Portuguese Italian quadrante = Dutch kwadrant = German quadrant = Swedish quadrant = Danish kvadrant, a quadrant, from Latin quadran(t-)s, a fourth part, a quarter, applied to a coin (see quadrans), a weight (a fourth of a pound), a measure (a fourth of a foot, of an acre, of a sextarius), from quattuor (quadr-) = English four: see four.
  2. Also quadron, quadrain, etc.: reduced from quadrant.
 

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/ˈkwɑdrənt/
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