From Middle French perpendiculaire, from Old French perpendiculer, from Latin perpendiculum (“plumb line”).
perpendicular (comparative more perpendicular, superlative most perpendicular)
- (geometry) 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 center of the earth, etc.
- Independent of or irrelevant to each other; orthogonal.
perpendicular (plural perpendiculars)
- (geometry) 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.
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