diagonal - definition, thesaurus and related words from WordNet-Online

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Adjective diagonal has 2 senses

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"
Antonym: parallel (indirect, via perpendicular, oblique)
Antonym: perpendicular (indirect, via oblique, parallel)
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

diagonal - (geometry) a straight line connecting any two vertices of a polygon that are not adjacent
--₁ is a kind of straight line
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
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
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 set
--₄ is a part of square matrix
Derived forms: verb diagonalize₁, verb diagonalise₁
solidus, slash, virgule, diagonal, stroke, separatrix - a punctuation mark (/) used to separate related items of information
--₅ is a kind of punctuation, punctuation mark