**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)

**Noun**perpendicular has 4 senses

- perpendicular - a straight line at right angles to another line

--_{1}is a kind of straight line

- perpendicular, perpendicular style, English-Gothic, English-Gothic architecture - a Gothic style in 14th and 15th century England; characterized by vertical lines and a four-centered (Tudor) arch and fan vaulting

--_{2}is a kind of Gothic, Gothic architecture

--_{2}has particulars: Tudor architecture - plumb line, perpendicular - a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point

--_{3}is a kind of cord

--_{3}has parts: plumb bob, plumb, plummet

--_{3}has particulars: lead line, sounding line; plumb rule - perpendicular - an extremely steep face

--_{4}is a kind of face