Dictionary

1diagonal

adjective di·ag·o·nal \dī-ˈa-gə-nəl, -ˈag-nəl\

of a straight line : joining two opposite corners of a shape (such as a square or rectangle) especially by crossing the center point of the shape

: not going straight across or up and down

Full Definition of DIAGONAL

1
a :  joining two vertices of a rectilinear figure that are nonadjacent or two vertices of a polyhedral figure that are not in the same face
b :  passing through two nonadjacent edges of a polyhedron <a diagonal plane>
2
a :  inclined obliquely from a reference line (as the vertical) <wood with a diagonal grain>
b :  having diagonal markings or parts <a diagonal weave>
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Examples of DIAGONAL

  1. The blanket is covered with diagonal stripes.
  2. <the diagonal design ran up the wall all the way from the lower left to the upper right-hand corner>

Origin of DIAGONAL

Latin diagonalis, from Greek diagōnios from angle to angle, from dia- + gōnia angle; akin to Greek gony knee — more at knee
First Known Use: 1563

Other Mathematics and Statistics Terms

abscissa, denominator, divisor, equilateral, exponent, hypotenuse, logarithm, oblique, radii, rhomb

2diagonal

noun

: a diagonal line, direction, or pattern

Full Definition of DIAGONAL

1
:  a diagonal straight line or plane
2
a (1) :  a diagonal direction (2) :  a diagonal row, arrangement, or pattern
b :  something oriented in diagonal position
3
:  slash 4
on the diagonal
:  in an oblique direction :  diagonally

Examples of DIAGONAL

  1. a design with strong diagonals
  2. <the ramp was set at a low diagonal to make it easier for physically challenged patrons>

First Known Use of DIAGONAL

1571

Other Mathematics and Statistics Terms

abscissa, denominator, divisor, equilateral, exponent, hypotenuse, logarithm, oblique, radii, rhomb
ON THE DIAGONAL Defined for Kids

1diagonal

adjective di·ag·o·nal \dī-ˈa-gə-nəl, -ˈag-nəl\

Definition of DIAGONAL for Kids

1
:  running from one corner to the opposite corner of a four-sided shape (as a square) <a diagonal line>
2
:  running in a slanting direction <diagonal stripes>
di·ag·o·nal·ly \-nə-lē\ adverb

2diagonal

noun

Definition of DIAGONAL for Kids

:  a line, direction, or pattern that runs in a slanting direction

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