Definition of diagonal noun from the Oxford Advanced Learner's Dictionary



BrE BrE//daɪˈæɡənl//
; NAmE NAmE//daɪˈæɡənl//
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a straight line that joins two opposite sides of something at an angle; a straight line that is at an angle Word Originmid 16th cent.: from Latin diagonalis, from Greek diagōnios ‘from angle to angle’, from dia ‘through’ + gōnia ‘angle’.
See the Oxford Advanced American Dictionary entry: diagonal

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