Mass1  —n. 1 shapeless body of matter. 2 dense aggregation of objects (mass of fibres). 3 (in sing. Or pl.; usu. Foll. By of) large number or amount. 4 (usu. Foll. By of) unbroken expanse (of colour etc.). 5 (prec. By the) a the majority. B (in pl.) Ordinary people. 6 physics quantity of matter a body contains. 7 (attrib.) On a large scale (mass hysteria; mass audience). —v. Assemble into a mass or as one body. [latin massa from greek]