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Quadrant quadrant  

Definition & Synonyms

• Quadrant

  1. (n.) The fourth part; the quarter.
  2. (n.) The quarter of a circle, or of the circumference of a circle, an arc of 90í, or one subtending a right angle at the center.
  3. (n.) 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. (n.) 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 90í, 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.