matrix

n 1: a rectangular array of elements (or entries) set out by rows and columns

2: an enclosure within which something originates or develops (from the Latin for womb)

3: the body substance in which tissue cells are embedded syn intercellular substance, ground substance

4: the formative tissue at the base of a nail 5: mold used in the production of phonograph records, type, or other relief surface

also matrices (pl)

Source: WordNet. Princeton University