- (n.) A right line drawn from one angle to another not adjacent, of a figure of four or more sides, and dividing it into two parts.
- (n.) A diagonal cloth; a kind of cloth having diagonal stripes, ridges or welts made in the weaving.
- (a.) Joining two not adjacent angles of a quadrilateral or multilateral figure; running across from corner to corner; crossing at an angle with one of the sides.
- (n.) A member, in a framed structure, running obliquely across a panel.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). diagonal. Retrieved September 20, 2026, from http://smartdefine.org/diagonal/definitions/1997166 |
| Chicago | Webster's. 2011. "diagonal" http://smartdefine.org/diagonal/definitions/1997166 (accessed September 20, 2026). |
| Harvard | Webster's 2011, diagonal, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/diagonal/definitions/1997166>. |
| MLA | Webster's. "diagonal" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/diagonal/definitions/1997166> |