(in Aristotelian thought) the matter or substance that constitutes a thing
a witness whose evidence is likely to be sufficiently important to influence the outcome of a trial
a synthetic composite material with a structure such that it exhibits properties not usually found in natural materials, especially a negative refractive index
a material having particles or constituents of nanoscale dimensions, or one that is produced by nanotechnology
a huge force of police/array of vehicles/materials
se desperdicia demasiada materia prima