A line or plane that is perpendicular to another.
A device such as a plumb line that is used in making or marking a perpendicular line.
A meal eaten at a tavern bar while standing up.
At or forming a right angle (to something).
In most houses, the walls are perpendicular to the floor.
Exactly upright; extending in a straight line toward the centre of the earth, etc.
Independent of or irrelevant to each other; orthogonal.