Exactly upright or vertical; pointing to the zenith; at right angles to the plane of the horizon; extending in a right line from any point toward the center of the earth.
At right angles to a given line or surface; as, the line ad is perpendicular to the line bc.
A line at right angles to the plane of the horizon; a vertical line or direction.
A line or plane falling at right angles on another line or surface, or making equal angles with it on each side.
Dancing is a perpendicular expression of a horizontal desire. George Bernard Shaw
This seems to be the law of progress in everything we do; it moves along a spiral rather than a perpendicular; we seem to be actually going out of the way, and yet it turns out that we were really moving upward all the time. Frances E. Willard
Companies have too many experts who block innovation. True innovation really comes from perpendicular thinking. Peter Diamandis
We can in fact first place the beam of rays of moving positive atomic ions in a plane perpendicular to the axis in which we see the spectral lines emitted by them. Johannes Stark
Now all oscillatory movements of such an electron can be conceived of as being split up into force, and two circular oscillations perpendicular to this direction rotating in opposite directions. Pieter Zeeman
