right angle

noun
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°.

Origin:
1350–1400; Middle English

right-angled, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
right angle
 
n
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
 
'right-angled
 
adj

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.
Cite This Source
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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