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.(adjective)
source: webster1913
noun (n)
a straight line at right angles to another line(noun.shape)
source: wordnet30
a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting(noun.cognition)
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(noun.artifact)