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ENGLISH THESAURUS & DICTIONARY

diagonal

adjective · noun

Words like diagonal

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24 words · adjective, nounSort by

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Similar meaningadjective

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MEANING & USAGE

Definitions & examples

01adjective

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”

02adjective

having an oblique or slanted direction

03noun

(geometry) a straight line connecting any two vertices of a polygon that are not adjacent

04noun

a line or cut across a fabric that is not at right angles to a side of the fabric

3 more meanings

05noun

an oblique line of squares of the same color on a checkerboard

“the bishop moves on the diagonals”

06noun

(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

07noun

a punctuation mark (‘/’) used to separate related items of information

Meanings and examples from Open English WordNet 2025. About our sources ↗

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Expressions with “diagonal”

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Explore multiword dictionary entries containing this word. Each has its own meanings and related words.

main diagonal diagonal matrix principal diagonal secondary diagonal