diagonal

US /daɪˈæɡ.ən.əl/
UK /daɪˈæɡ.ən.əl/
"diagonal" picture
1.

a straight line joining two opposite corners of a straight-sided shape

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Draw a diagonal line from one corner to the other.
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The shortest path across the square is its diagonal.
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crossslantoblique
1.

joining two opposite corners of a straight-sided shape

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The pattern features diagonal stripes.
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The path cuts diagonal across the field.
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obliqueslantingcantedangledcrosswise