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Meaning Of Perpendicular
a.
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.
a.
At right angles to a given line or surface; as, the
line ad is perpendicular to the line bc.
n.
A line at right angles to the plane of the horizon;
a vertical line or direction.
n.
A line or plane falling at right angles on another
line or surface, or making equal angles with it on each side.