Definitions from Wiktionary (Perpendicular)

▸ adjective:  (geometry) At or forming a right angle (to something).
▸ adjective:  Exactly upright; extending in a straight line toward the centre of the earth, etc.
▸ adjective:  Independent of or irrelevant to each other; orthogonal.
▸ noun:  (geometry) A line or plane that is perpendicular to another.
▸ noun:  A device such as a plumb line that is used in making or marking a perpendicular line.
▸ noun:  (obsolete, slang) A meal eaten at a tavern bar while standing up.
▸ adjective:  (architecture) Of a style of English Gothic architecture from the fourteenth and fifteenth centuries, marked by stiff and rectilinear lines, mostly vertical window-tracery, depressed or four-centre arch, fan-tracery vaulting, and panelled walls.

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