Any material considered crucial to national security concerns and military applications. Examples include natural resources, such as oil; alloys, such as steel, aluminum, and titanium; and composite materials, such as advanced plastics, polymers and ceramics.

Any engineered material composed of two radically different materials in a tightly bonded matrix and having properties significantly different from either constituent

The material used to store genetic information in the nuclei, mitochondria or plastids of an organism's cells; either DNA or RNA

(philosophy, natural science) The stuff or matter of which something is made.

(Marxism) A methodological approach to the study of society, economics, and history, looking for the causes of developments and changes in human society in the means by which humans collectively produce the necessities of life.

plural of bill of material

plural of bill of materials

(law) A person with information alleged to be material concerning a criminal proceeding, and who therefore may be detained to insure their participation in such a proceeding.

plural of material witness

The study of materials; their internal structures, properties and modes of failure.