Definition of "perpendicular" in English

adjective

1. (geometry) At or forming a right angle (to something).

   • In most houses, the walls are perpendicular to the floor.

2. Exactly upright; extending in a straight line toward the centre of the earth, etc.

3. Independent of or irrelevant to each other; orthogonal.

noun

1. (geometry) A line or plane that is perpendicular to another.

2. A device such as a plumb line that is used in making or marking a perpendicular line.

3. (obsolete, slang) A meal eaten at a tavern bar while standing up.