1.a straight line at right angles to another line
2.a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting
3.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
4.an extremely steep face
5.intersecting at or forming right angles;
the axes are perpendicular to each other
6.at right angles to the plane of the horizon or a base line;
a vertical camera angle
7.extremely steep;
the great perpendicular face of the cliff