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Adjective perpendicular has 3 senses
- perpendicular - intersecting at or forming right angles; "the axes are perpendicular to each other"
Antonyms: oblique, bias, catacorner, cata-cornered, catercorner, cater-cornered, catty-corner, catty-cornered, kitty-corner, kitty-cornered, crabwise, sideways, diagonal, nonparallel, parallel, antiparallel, collateral, nonconvergent, nonintersecting
- vertical, perpendicular - at right angles to the plane of the horizon or a base line; "a vertical camera angle"; "the monument consists of two vertical pillars supporting a horizontal slab"; "measure the perpendicular height"
- perpendicular - extremely steep; "the great perpendicular face of the cliff"
Antonym: gradual (indirect, via steep)