1 [C] a mass (of sth) a dense mass of smoke 浓烟密布 (informal 非正式) There were masses of people at the market today. 今天集市上人山人海。

2 the masses [pl] ordinary people when considered as a political group 群众；百姓

3 [U] (in physics) the quantity of material that sth contains （物理）质量

4 Mass [C,U] the ceremony in some Christian churches when people eat bread and drink wine in order to remember the last meal that Christ had before he died 弥撒: to go to Mass 去做弥撒