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vertical angle

noun Geometry.
  1. one of two opposite and equal angles formed by the intersection of two lines.
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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
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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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.