adjective

1. of, at, or in the vertex or zenith
2. 1. perpendicular, or at a right angle, to the plane of the horizon; upright, straight up or down, etc.
   2. at a right angle to the plane of the supporting surface
3. at, or made up of elements at, different levels, as of industrial production and distribution or of social status
4. Anat., Zool. of the vertex of the head
5. Biol. in the direction in which the axis lies; lengthwise

Etymology: Fr < LL verticalis < L vertex (gen. verticis): see vertex

noun

1. a vertical line, plane, circle, etc.
2. upright position