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Adjective diagonal has 2 senses
  1. diagonal - at an angle; especially connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face; "a diagonal line across the page"
    parallel (indirect, via perpendicular, oblique)
    Antonym: perpendicular (indirect, via oblique, parallel)
  2. aslant, aslope, diagonal, slanted, slanting, sloped, sloping - having an oblique or slanted direction
    Antonym: horizontal (indirect, via vertical, inclined)
    Antonyms: vertical, perpendicular (indirect, via inclined, horizontal)
Noun diagonal has 5 senses
  1. diagonal - (geometry) a straight line connecting any two vertices of a polygon that are not adjacent
    --1 is a kind of
    straight line
  2. diagonal, bias - a line or cut across a fabric that is not at right angles to a side of the fabric
    --2 is a kind of straight line
  3. diagonal - an oblique line of squares of the same color on a checkerboard; "the bishop moves on the diagonals"
    --3 is a kind of
    line; line
    --3 is a part of checkerboard
    --3 has particulars: main diagonal, principal diagonal; secondary diagonal
  4. diagonal - (mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry
    --4 is a kind of
    --4 is a part of square matrix
    Derived forms: verb diagonalize1, verb diagonalise1
  5. solidus, slash, virgule, diagonal, stroke, separatrix - a punctuation mark (/) used to separate related items of information
    --5 is a kind of punctuation, punctuation mark
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