a space between two lines or surfaces that mean
shape formed by two lines meeting at a point
Cases of word usage
1) at an angle of 90 degrees (to another line or surface); upright (perpendicular)
2) placed vertically (at an angle of 90 degrees to the ground); honourable; straightforward in behaviour (upright)
3) (of a line or plane) at a right angle to the earth's surface or to another line or surface (vertical)