| diagonal | | |
| n. (shape) | 1. diagonal | (geometry) a straight line connecting any two vertices of a polygon that are not adjacent. |
| ~ geometry | the pure mathematics of points and lines and curves and surfaces. |
| ~ straight line | a line traced by a point traveling in a constant direction; a line of zero curvature.; "the shortest distance between two points is a straight line" |
| n. (shape) | 2. bias, diagonal | a line or cut across a fabric that is not at right angles to a side of the fabric. |
| ~ straight line | a line traced by a point traveling in a constant direction; a line of zero curvature.; "the shortest distance between two points is a straight line" |
| n. (group) | 3. diagonal | an oblique line of squares of the same color on a checkerboard.; "the bishop moves on the diagonals" |
| ~ checker board, checkerboard | a board having 64 squares of two alternating colors. |
| ~ main diagonal, principal diagonal | the diagonal of a square matrix running from the upper left entry to the lower right entry. |
| ~ secondary diagonal | the diagonal of a square matrix running from the lower left entry to the upper right entry. |
| ~ line | a formation of people or things one behind another.; "the line stretched clear around the corner"; "you must wait in a long line at the checkout counter" |
| ~ line | a formation of people or things one beside another.; "the line of soldiers advanced with their bayonets fixed"; "they were arrayed in line of battle"; "the cast stood in line for the curtain call" |
| n. (group) | 4. diagonal | (mathematics) a set of entries in a square matrix running diagonally either from the upper left to lower right entry or running from the upper right to lower left entry. |
| ~ math, mathematics, maths | a science (or group of related sciences) dealing with the logic of quantity and shape and arrangement. |
| ~ set | (mathematics) an abstract collection of numbers or symbols.; "the set of prime numbers is infinite" |
| ~ square matrix | a matrix with the same number of rows and columns. |
| n. (communication) | 5. diagonal, separatrix, slash, solidus, stroke, virgule | a punctuation mark (/) used to separate related items of information. |
| ~ punctuation mark, punctuation | the marks used to clarify meaning by indicating separation of words into sentences and clauses and phrases. |
| adj. | 6. diagonal | connecting two nonadjacent corners of a plane figure or any two corners of a solid that are not in the same face.; "a diagonal line across the page" |
| ~ oblique | slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled.; "the oblique rays of the winter sun"; "acute and obtuse angles are oblique angles"; "the axis of an oblique cone is not perpendicular to its base" |
| adj. | 7. aslant, aslope, diagonal, slanted, slanting, sloped, sloping | having an oblique or slanted direction. |
| ~ inclined | at an angle to the horizontal or vertical position.; "an inclined plane" |
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