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From: Webster's Revised Unabridged Dictionary (1913)

 Quad·ran·tal a.  Geom. Of or pertaining to a quadrant; also, included in the fourth part of a circle; as, quadrantal space.
 Quadrantal triangle, a spherical triangle having one side equal to a quadrant or arc of 90°.
 Quadrantal versor, a versor that expresses rotation through one right angle.