diagonal Definition in the Cambridge English Dictionary
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Definition of “diagonal” - English Dictionary

Definition of "diagonal" - American English Dictionary

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diagonaladjective

 us   /dɑɪˈæɡ·ə·nəl/
geometry (of a ​line) ​straight and ​sloping, so that it is neither ​horizontalnorvertical: A diagonal ​line in a ​circle is often used as a ​symbol to show that ​certainbehavior is ​forbidden.
(Definition of diagonal from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "diagonal" - British English Dictionary

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diagonaladjective

uk   us   /daɪˈæɡ.ən.əl/
A diagonal ​line is ​straight and ​sloping, not ​horizontal or ​vertical, for ​examplejoining two ​oppositecorners of a ​square or other ​flatshape with four ​sides: The ​book has a diagonal ​blackstripe on the ​cover. moving in a diagonal ​line: The ​artistachieves this ​effect using ​short diagonal ​strokes. Peters ​received a diagonal ​pass and ​headed the ​ball into the ​net.
More examples
diagonally
adverb uk   us   /-i/
It's ​quickest if you ​cut diagonally ​across the ​park.

diagonalnoun [C]

uk   us   /daɪˈæɡ.ən.əl/ specialized
a ​straightline that ​joins two ​oppositecorners of a four-sided ​flatshape, such as a ​square
(Definition of diagonal from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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