Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Latin
Origin: diagonalis, from Greek diagonios 'from angle to angle', from gonia 'angle'

diagonal

adjective
     
Related topics: Shapes, Patterns, Maths
di‧ag‧o‧nal
1HMHM a diagonal line is straight and joins two opposite corners of a flat shape, usually a square [↪ horizontal, vertical]
2CF following a sloping angle:
diagonal parking spaces
diagonal noun [countable]
diagonally adverb:
The path goes diagonally across the field.

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