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English definition of “diagonal”

diagonal

adjective uk   /daɪˈæɡ.ən.əl/ us  
A diagonal line is straight and sloping, not horizontal or vertical, for example joining two opposite corners of a square or other flat shape with four sides: The book has a diagonal black stripe on the cover. moving in a diagonal line: Peters received a diagonal pass and headed the ball into the net.
diagonally
adverb uk   /-i/ us  
It's quickest if you cut diagonally across the park.

diagonal

noun [C] uk   /daɪˈæɡ.ən.əl/ specialized us  
a straight line that joins two opposite corners of a four-sided flat shape, such as a square
(Definition of diagonal from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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