mass /mæs/ n.［c］ 1.(聚成一体的)团，块：a mass of hot air 一团热空气; a solid mass of earth 一大块泥土；a mass of sand 一堆沙；masses of ice冰块  2. 众多，大量：a mass of treasure 大宗财宝； the (great) mass of… 大部分，大多数 3. (pl.) 群众，民众：rely on the masses  依靠群众 4. 质量：mass defect 质量亏损；mass law 质量定律