### 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.