Vertical Vertical Vatican Museums An object is in a vertical position when it is aligned in an "up-down" direction, Perpendicular to the Horizon.

In science the vertical (or Plumb line) is the direction of the force of Gravity.
A pair of angles are said to be vertical if they share the same Vertex and are bounded by the same pair of lines but are opposite to each other.
In Music the vertical aspect is Simultaneity, either intervals or harmony, as opposed to Succession or the linear aspect
In Marketing and Business in general, a vertical informally means a Vertical market.