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1. Mathematics Intersecting at or forming right angles.
2. Being at right angles to the horizontal; vertical. See Synonyms at vertical.
3. often Perpendicular Of or relating to a style of English Gothic architecture of the 1300s and 1400s, characterized by the use of fan vaulting and broad windows with many mullions.
In a perpendicular position.
1. Mathematics A line or plane perpendicular to a given line or plane.
2. A perpendicular position.
3. A device, such as a plumb line, that is used in marking the vertical from a given point.
4. A vertical or nearly vertical line or plane.

[Middle English perpendiculer, from Old French, from Latin perpendiculāris, from perpendiculum, plumb line, from perpendere, to weigh carefully : per-, per- + pendere, to weigh; see (s)pen- in Indo-European roots.]

per′pen·dic′u·lar′i·ty (-lăr′ĭ-tē) n.
per′pen·dic′u·lar·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.perpendicularity - the relation of opposition between things at right angles
opposition - a direction opposite to another
2.perpendicularity - the quality of being at right angles to a given line or plane (especially the plane of the horizon)
oblongness, rectangularity - the property of being shaped like a rectangle
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
It was near noon; I knew by the perpendicularity of the sun's rays, which were no longer refracted.
For beside all the resistless beauty of form, it possesses in the highest degree the property of the perpendicularity of all the figures." This perpendicularity we demand of all the figures in this picture of life.
"The perpendicularity of the gun was exact, its direction to the zenith of the spot incontestible; and the moon passing to the zenith of the spot, we ought to reach it at the full.
The ascent is precipitous, but the path is cut into continual and short windings, which enable you to surmount the perpendicularity of the mountain.
A man with the requisite intellectual capacity and moral perpendicularity.
Varying grades are available, from commercial qualities optimised for more favourable pricing and higher volumes to precision grades with more accurate orientation and perpendicularity, and better surface quality.
The heuristics they define include cover ratio, big brick, perpendicularity, vertical boundary, T-shaped joining, and covered edge by center (See Appendix for an explanation).
The six-axis, noncontact TBT gauge combines automatic thread start and bottle alignment with confocal white-light technology to measure wall thickness and vision technology to measure neck finish, body dimensions, and perpendicularity.
Photo of Abu Simbel, Luxor, Egypt, creative commons via -pixabay, undated photo CAIRO -- 22 February 2018: Artistic celebrations were held Wednesday to mark the sun perpendicularity on Abu Simbel temple.
The aim of this paper are to determine the effect and optimization of process parameters (cutting speed and plasma gas pressure) on surface roughness, kerf with and cut perpendicularity in plasma arc cutting of stainless steel a 5 mm thick using Grey relational analysis coupled with Taguchi method.