Definitions:
the cultural, social, or political environment in which something develops

a mass of fine-grained rock in which gems, crystals, or fossils are embedded

a mould in which something, such as a record or printing type, is cast or shaped

a rectangular array of quantities or expressions in rows and columns that is treated as a single entity and manipulated according to particular rules

an organizational structure in which two or more lines of command, responsibility, or communication may run through the same individual