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. adjective
    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
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    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
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  2. adjective
    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
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    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
    gradual
    (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
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  3. adjective
    extremely steep
    “the great perpendicular face of the cliff”
    Synonyms:
    steep
    having a sharp inclination
  4. noun
    a straight line at right angles to another line
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    type of:
    straight line
    a line traced by a point traveling in a constant direction; a line of zero curvature
  5. noun
    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
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    types:
    lead line, sounding line
    (nautical) plumb line for determining depth
    plumb rule
    a plumb line attached to a narrow board
    type of:
    cord
    a line made of twisted fibers or threads
  6. noun
    an extremely steep face
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    type of:
    face
    a vertical surface of a building or cliff
  7. noun
    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
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    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
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