| MAT | the part of algebra that deals with the theory of matrices |
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| MAT | determination of a matrix that when multiplied by the given matrix will yield a unit matrix |
| MAT | the multiplication of matrices |
| MAT | a mathematical operation involving matrices |
| MAT | a printer that represents each character as a pattern of dots from a dot matrix |
| MAT | the interchange of each row of a square matrix with the corresponding column |
| MAT | a married woman (usually middle-aged with children) who is staid and dignified |
| MAT | a woman in charge of nursing in a medical institution |
| MAT | a wardress in a prison |
| MAT | befitting or characteristic of a fully mature woman |
| MAT | a name derived from the name of your mother or a maternal ancestor |
| MAT | (Hindu) a religious posture |