|Origin:||verticalis, from Latin vertex; VERTEX|
pointing up in a line that forms an angle of 90° with a flat surface [≠ horizontal; ↪ diagonal]:
the vertical axis of a graph
vertical window blinds
vertical cliff/climb/drop etc (=one that is very high or steep)
a gorge lined with vertical cliffs
having a structure in which there are top, middle, and bottom levels:
Formal communication channels are usually vertical.