| DI | the branch of medical science dealing with the classification of disease |
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| DI | a punctuation mark (/) used to separate related items of information |
| DI | (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 |
| DI | an oblique line of squares of the same color on a checkerboard |
| DI | a line or cut across a fabric that is not at right angles to a side |
| DI | (geometry) a straight line connecting any two vertices of a polygon that are not adjacent |
| DI | having an oblique or slanted direction |
| DI | at an angle |
| DI | a square matrix with all off-diagonal elements equal to zero |
| DI | (matrix algebra) changing a square matrix to diagonal form (with all non-zero elements on the principal diagonal) |
| DI | transform a matrix to a diagonal matrix |
| DI | (mathematics) capable of being transformed into a diagonal matrix |