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vertical angle

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noun Geometry.
  1. one of two opposite and equal angles formed by the intersection of two lines.

Origin of vertical angle

First recorded in 1565–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for vertical angles

vertical angles

pl n
  1. geometry the pair of equal angles between a pair of intersecting lines; opposite anglesAlso called: vertically opposite angles
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

vertical angles in Science

vertical angles

[vûrtĭ-kəl]
  1. Two angles formed by two intersecting lines and lying on opposite sides of the point of intersection.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.