# perpendicular

Two lines that form a T are perpendicular to each other. They meet at a right angle. A person who is standing is perpendicular to the earth.

Use perpendicular to describe lines, angles, and direction. In geometry a perpendicular angle is 90 degrees, a perfect L. On a compass, East and North are perpendicular to each other. The term can be used more generally to describe any steep angle. You might talk about a ski slope that is nearly perpendicular but that's impossible since gravity would make you fall off a 90-degree angle. But if it's close enough, no one's really measuring.

Definitions of perpendicular
1

### adj intersecting at or forming right angles

“the axes are perpendicular to each other”
Synonyms:
normal
forming a right angle
orthogonal, rectangular
having a set of mutually perpendicular axes; meeting at right angles
right
having the axis perpendicular to the base
Antonyms:
parallel
being everywhere equidistant and not intersecting
oblique
slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled
comparable
able to be compared or worthy of comparison
convergent
tending to come together from different directions
divergent, diverging
tending to move apart in different directions
inclined
at an angle to the horizontal or vertical position
antiparallel
(especially of vectors) parallel but oppositely directed
collateral
situated or running side by side
nonconvergent, nonintersecting
(of lines, planes, or surfaces) never meeting or crossing
bias
slanting diagonally across the grain of a fabric
cata-cornered, catacorner, cater-cornered, catercorner, catty-corner, catty-cornered, kitty-corner, kitty-cornered
slanted across a polygon on a diagonal line
crabwise, sideways
(of movement) at an angle
diagonal
connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face
nonparallel
(of e.g. lines or paths) not parallel; converging
oblique-angled
having oblique angles
symmetric, symmetrical
having similarity in size, shape, and relative position of corresponding parts

### adj at right angles to the plane of the horizon or a base line

“measure the perpendicular height”
Synonyms:
vertical
steep
having a sharp inclination
plumb
exactly vertical
upended
turned up on end
unsloped, upright
in a vertical position; not sloping
straight
having no deviations
Antonyms:
horizontal
parallel to or in the plane of the horizon or a base line
inclined
at an angle to the horizontal or vertical position
(of a topographical gradient) not steep or abrupt
crosswise
in the shape of (a horizontal piece on) a cross
flat
horizontally level
level
being on a precise horizontal plane
naiant, swimming
applied to a fish depicted horizontally
atilt, canted, leaning, tilted, tipped
departing or being caused to depart from the true vertical or horizontal
aslant, aslope, diagonal, slanted, slanting, sloped, sloping
having an oblique or slanted direction
high-pitched
set at a sharp or high angle or slant
low-pitched
set at a low angle or slant
monoclinal
of a geological structure in which all strata are inclined in the same direction
pitched
set at a slant
salient
represented as leaping (rampant but leaning forward)
sidelong
inclining or directed to one side
skew, skewed
having an oblique or slanting direction or position
oblique
slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled

“the great perpendicular face of the cliff”
Synonyms:
steep
having a sharp inclination

### n a straight line at right angles to another line

Type of:
straight line
a line traced by a point traveling in a constant direction; a line of zero curvature

### n 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:
plumb line
Types:
(nautical) plumb line for determining depth
plumb rule
a plumb line attached to a narrow board
Type of:
cord

### n an extremely steep face

Type of:
face
a vertical surface of a building or cliff

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

Synonyms:
English-Gothic, English-Gothic architecture, perpendicular style
Types:
Tudor architecture
a style of English-Gothic architecture popular during the Tudor period; characterized by half-timbered houses
Type of:
Gothic, Gothic architecture
a style of architecture developed in northern France that spread throughout Europe between the 12th and 16th centuries; characterized by slender vertical piers and counterbalancing buttresses and by vaulting and pointed arches