Definition: Perpendicular

From New World Encyclopedia


From Middle French perpendiculaire, from Old French perpendiculer, from Latin perpendiculum (“plumb line”).


perpendicular (comparative more perpendicular, superlative most perpendicular)

  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 center of the earth, etc.
  3. Independent of or irrelevant to each other; orthogonal.


perpendicular (plural perpendiculars)

  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.


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