right angle

the angle formed by two radii of a circle that are drawn to the extremities of an arc equal to one quarter of the circle; the angle formed by two perpendicular lines that intersect; an angle of 90°.

1350–1400; Middle English

right-angled, adjective
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World English Dictionary
right angle
1.  the angle between two radii of a circle that cut off on the circumference an arc equal in length to one quarter of the circumference; an angle of 90° or π/2 radians
2.  at right angles perpendicular or perpendicularly
Related: orthogonal

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
right angle   (rīt)  Pronunciation Key 
An angle having a measure of 90°.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

right angle definition

An angle measuring ninety degrees, formed by the intersection of two perpendicular lines. (Compare acute angle and obtuse angle.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The right colic flexure is situated in the upper and right angle of
  intersection of the subcostal and right lateral lines.
Intersection crash data indicates signalized intersections have a high number
  of right angle and head-on left turn crashes.
If the referee is in the right position with the right angle, he has a much
  better chance to make the right call.
Rotate it through a right angle, or a multiple of a right angle, and it is
  indistinguishable from its unrotated self.
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