adj

diagonal

deye-AG-nuhl

adj

Slanted; running at an angle rather than straight up-and-down or side-to-side.

"She drew a diagonal line across the page to cross it out."

"The stairs run diagonal to the main hallway."

noun

A line joining two non-adjacent corners of a shape, such as a square.

"The diagonal of the rectangle measured exactly ten centimeters."

How to Use Diagonal

Learner’s notes

In plain EnglishSlanted, or a slanted line — the opposite of straight horizontal or vertical.

Common pairings

diagonal line diagonal stripes move diagonally

diagonals plural

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Can you complete this real example?

She drew a _____ line across the page to cross it out.

From Latin diagonalis, from Greek diagonios ("from angle to angle"), from dia- ("across") + gonia ("angle").

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