perpendicular ADJECTIVE 1) at an angle of 90° to a given line, plane, or surface. 2) at an angle of 90° to the ground; vertical. 3) (Perpendicular) of the latest stage of English Gothic church architecture (late 14th to mid 16th centuries), characterized by broad arches and elaborate fan vaulting.
NOUN a perpendicular line.
DERIVATIVES perpendicularity noun perpendicularly adverb.
ORIGIN Latin perpendicularis, from perpendiculum 'plumb line' .

English terms dictionary. 2015.

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