/ daɪˈægənl; NAmE / adjective , noun
■ adjective
( of a straight line ) at an angle; joining two opposite sides of sth at an angle :
diagonal stripes
► di·ag·onal·ly / -nəli; NAmE / adverb :
Walk diagonally across the field to the far corner and then turn left.
■ noun
a straight line that joins two opposite sides of sth at an angle; a straight line that is at an angle
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WORD ORIGIN
mid 16th cent.: from Latin diagonalis , from Greek diagōnios from angle to angle, from dia through + gōnia angle.