matrix (Noun) — (mathematics) a rectangular array of quantities or expressions set out by rows and columns; treated as a single element and manipulated according to rules.
matrix (Noun) — (geology) a mass of fine-grained rock in which fossils, crystals, or gems are embedded.
matrix (Noun) — An enclosure within which something originates or develops.
matrix (Noun) — The body substance in which tissue cells are embedded.
matrix (Noun) — The formative tissue at the base of a nail.
matrix (Noun) — Mould used in the production of phonograph records, type, or other relief surface.