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

diagonal

noun
 
/daɪˈæɡənl/
 
/daɪˈæɡənl/
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  1. a straight line that joins two opposite sides of something at an angle; a straight line that is at an angleTopics Colours and Shapesc2
    Word Originmid 16th cent.: from Latin diagonalis, from Greek diagōnios ‘from angle to angle’, from dia ‘through’ + gōnia ‘angle’.
See diagonal in the Oxford Advanced American DictionarySee diagonal in the Oxford Learner's Dictionary of Academic English

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