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1.
intersecting at or forming right angles
the axes are perpendicular to each other
2.
at right angles to the plane of the horizon or a base line
measure the perpendicular height
3.
extremely steep
the great perpendicular face of the cliff
'perpendicular' - used as a noun
4.
a straight line at right angles to another line
5.
a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting
6.
a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point
7.
an extremely steep face
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