A table of data. / The cavity or mold in which anything is formed. / (biology) The material or tissue in which more specialized structures are embedded.

(science fiction) A simulated reality to which many humans are connected. In some works created by sentient machines to subdue humans.

A minor modern religion based on the science-fiction franchise The Matrix.

plural of matrix

(business, of an organisation) Using matrix management.

(mathematics) A matrix having the same number of rows as columns.

(linear algebra) An identity matrix

(linear algebra, probability theory, statistics) A matrix having the property that the entries in each column are non-negative, real and sum to 1.

(linear algebra) Of a matrix A, another matrix B such that A multiplied by B and B multiplied by A both equal the identity matrix.

(linear algebra) A diagonal matrix all of the diagonal elements of which are equal to 1.