Definitions
1.nounA line or plane that is perpendicular to another.
2.nounA device such as a plumb line that is used in making or marking a perpendicular line.
3.nounA meal eaten at a tavern bar while standing up.
4.adjectiveAt or forming a right angle (to something)."In most houses, the walls are perpendicular to the floor."
5.adjectiveExactly upright; extending in a straight line toward the centre of the earth, etc.
6.adjectiveIndependent of or irrelevant to each other; orthogonal.