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.

(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

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