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WordReference Random House Learner's Dictionary of American English © 2024di•ag•o•nal /daɪˈægənəl/USA pronunciation adj. - Mathematicsconnecting two angles that are not next to each other, such as at opposite corners of a square:a diagonal line.
- having an oblique or slanting direction:diagonal stripes.
n. [countable] - a diagonal line or plane.
di•ag•o•nal•ly, adv. WordReference Random House Unabridged Dictionary of American English © 2024di•ag•o•nal (dī ag′ə nl, -ag′nl),USA pronunciation adj. - Mathematics
- connecting two nonadjacent angles or vertices of a polygon or polyhedron, as a straight line.
- extending from one edge of a solid figure to an opposite edge, as a plane.
- having an oblique direction.
- having oblique lines, ridges, markings, etc.
n. - a diagonal line or plane.
- Printingvirgule.
- a diagonal row, part, pattern, etc.
- Sport[Manège.](of a horse at a trot) the foreleg and the hind leg, diagonally opposite, which move forward simultaneously.
- TextilesSee diagonal cloth.
- Mathematicsa set of entries in a square matrix running either from upper left to lower right (main diagonal or principal diagonal) or lower left to upper right (secondary diagonal.)
- [Chess.]one of the oblique lines of squares on a chessboard:He advanced his bishop along the open diagonal.
- Greek diagó̄n(ios) from angle to angle (see dia-, -gon) + Latin -ālis -al1
- Latin diagōnālis
- 1535–45
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