Definitions for "Perpendicular"
(style) - historical division of English Gothic architecture covering the period from . 1335-50 to . 1530. It formed a backlash against the richness of the Decorated style and emphasized the straight lines of a building, with a strong vertical emphasis.
English architectural style (1330-1540).
a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting
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.
Keywords:  steep, cliff, extremely, face, great
an extremely steep face
extremely steep; "the great perpendicular face of the cliff"
Keywords:  something
At 900 to something else.