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American Dictionary of the English Language

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Diagonal


DIAGONAL, adjective [Gr. A corner.]

1. In geometry, extending from one angle to another of a quadrilateral figure, and dividing it into two equal parts.

2. Being in an angular direction.

DIAGONAL, noun A right line drawn from angle to angle of a quadrilateral figure, as a square or parallelogram, and dividing it into two equal parts. It is sometimes called the diameter, and sometimes the diametral.