1. (noun) perpendicular
a straight line at right angles to another line
Synonyms: perpendicular style, plumb line
Antonyms: nonconvergent, diagonal, gradual, catty-corner, sideways, crabwise, oblique-angled, collateral, kitty-corner, catty-cornered, antiparallel, catercorner, nonparallel, catacorner, cater-cornered, kitty-cornered, parallel, oblique, bias, nonintersecting, cata-cornered
2. (noun) 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
Synonyms: perpendicular style, plumb line, perpendicular
Antonyms: oblique, collateral, nonparallel, nonconvergent, catty-corner, bias, gradual, catacorner, oblique-angled, antiparallel, crabwise, kitty-corner, cata-cornered, nonintersecting, catercorner, kitty-cornered, diagonal, sideways, catty-cornered, parallel, cater-cornered
3. (noun) 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
Synonyms: perpendicular style, plumb line, perpendicular
Antonyms: sideways, cater-cornered, catty-corner, oblique, parallel, catacorner, nonintersecting, catercorner, antiparallel, oblique-angled, crabwise, collateral, catty-cornered, nonparallel, bias, cata-cornered, kitty-corner, kitty-cornered, diagonal, gradual, nonconvergent
4. (adj) perpendicular
an extremely steep face
Synonyms: perpendicular style, plumb line
Antonyms: parallel, catercorner, bias, oblique-angled, catty-corner, oblique, crabwise, nonconvergent, catty-cornered, catacorner, kitty-corner, sideways, nonintersecting, gradual, collateral, cata-cornered, diagonal, antiparallel, kitty-cornered, cater-cornered, nonparallel
5. (adj) perpendicular
intersecting at or forming right angles
Synonyms: vertical
Antonyms: collateral, catty-corner, oblique, catercorner, catty-cornered, bias, sideways, nonparallel, parallel, crabwise, diagonal, gradual, nonconvergent, cata-cornered, kitty-corner, nonintersecting, catacorner, antiparallel, oblique-angled, cater-cornered, kitty-cornered
6. (adj) vertical, perpendicular
at right angles to the plane of the horizon or a base line
Synonyms: erect, upright, perpendicular, vertical
Antonyms: cata-cornered, oblique-angled, oblique, crabwise, nonparallel, gradual, antiparallel, sideways, diagonal, kitty-cornered, parallel, kitty-corner, bias, nonintersecting, catacorner, nonconvergent, catty-corner, cater-cornered, catty-cornered, collateral, catercorner
7. (adj) perpendicular
extremely steep
Synonyms: vertical
Antonyms: catacorner, cater-cornered, antiparallel, collateral, catercorner, oblique, kitty-cornered, nonintersecting, kitty-corner, nonconvergent, catty-cornered, gradual, sideways, crabwise, nonparallel, parallel, cata-cornered, diagonal, bias, catty-corner, oblique-angled
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Synonyms for perpendicular 
