Meaning

• 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.

Meaning

• 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.