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Perpendicularity

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Perpendicularity 

Two lines are said to be perpendicular if they form a right angle; in space, such lines need not necessarily intersect. A line l and a plane p are perpendicular if l is perpendicular to every line lying in p. Two planes are perpendicular if they intersect to form a right dihedral angle. Orthogonality is a more general, and sometimes synonymous, concept of perpendicularity.
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It was near noon; I knew by the perpendicularity of the sun's rays, which were no longer refracted.
20,000 Leagues Under The Sea by Verne, Jules View in context
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.
Round The Moon by Verne, Jules View in context
For beside all the resistless beauty of form, it possesses in the highest degree the property of the perpendicularity of all the figures.
Essays, First Series by Emerson, Ralph Waldo View in context
 
 
 
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