The cavity or mold in which anything is formed. • The womb. • The metaphorical place where something is made, formed, or given birth. • The material or tissue in which more specialized structures are embedded. • An extracellular matrix, the material or tissue between the cells of animals or plants. • Part of the mitochondrion. • The medium in which bacteria are cultured. • A table of data. • A rectangular arrangement of numbers or terms having various uses such as transforming coordinates in geometry, solving systems of linear equations in linear algebra and representing graphs in graph theory. • A two-dimensional array. • Alternative letter-case form of Matrix; a controlled environment or situation in which people behave in ways that conform to pre-determined roles. • A grid-like arrangement of electronic components, especially one intended for information coding, decoding or storage. • A geological matrix. • The sediment surrounding and including the artifacts, features, and other materials at a site. • The environment from which a given sample is taken. • In hot metal typesetting, a mold for casting a letter. • In printmaking, the plate or block used, with ink, to hold the image that makes up the print. • The five simple colours (black, white, blue, red, and yellow) from which all the others are formed. • A binding agent of composite materials, e.g. resin in fibreglass. • Matrix clause is a clause that has another (subordinate) clause embedded within it.