Wiktionary
n. (context mathematics English) The larger matrix from which a submatrix is derived.
Wikipedia
In mathematics and theoretical physics, a supermatrix is a Z-graded analog of an ordinary matrix. Specifically, a supermatrix is a 2×2 block matrix with entries in a superalgebra (or superring). The most important examples are those with entries in a commutative superalgebra (such as a Grassmann algebra) or an ordinary field (thought of as a purely even commutative superalgebra).
Supermatrices arise in the study of super linear algebra where they appear as the coordinate representations of a linear transformations between finite-dimensional super vector spaces or free supermodules. They have important applications in the field of supersymmetry.
Usage examples of "supermatrix".
Mot Pulk's strength was vastly augmented because now he drew on the power of the supermatrix of ten thousand interconnected minds that gave the Great Game its life.