vertical

Concise Oxford English Dictionary © 2008 Oxford University Press:
vertical/ˈvɜːtɪkl/

▶adjective

• 1 at right angles to a horizontal plane; having the top directly above the bottom.

• 2 involving or passing through all the different levels of a hierarchy or progression.

• 3 Anatomy relating to the crown of the head.

• 4 archaic at the zenith or the highest point.

▶noun

• 1 a vertical line or plane.

• 2 an upright structure.

– derivatives
verticality noun,
verticalize (or verticalise) verb,
vertically adverb.

– origin C16 (in the sense ‘directly overhead’): from Fr., or from late L. verticalis, from vertex (see vertex).