adjective Standing, pointing, or moving straight up or down; parallel to the local direction of gravity; along the direction of a plumb line; perpendicular to something horizontal.
vertical lines
adjective In a two-dimensional Cartesian co-ordinate system, describing the axis y oriented normal (perpendicular, at right angles) to the horizontal axis x.
adjective In a three-dimensional co-ordinate system, describing the axis z oriented normal (perpendicular, orthogonal) to the basic plane xy.
adjective Of or pertaining to vertical markets.
adjective Involving different vintages of the same wine type from the same winery.
adjective Of an interval: having the two notes sound simultaneously.
noun A vertex or zenith.
noun A vertical geometrical figure; a perpendicular.