purification
noun [ U ] uk/ˌpjʊə.rɪ.fɪˈkeɪ.ʃən/ us/ˌpjʊr.ə.fəˈkeɪ.ʃən/
(NOT MIXED)
净化，提纯
the act of removing harmful substances from something
a water purification plant 净水厂
an air purification system 空气净化系统
(MORALLY GOOD)
（某些宗教中的）涤罪，洗罪
in some religions, the act of removing from a person, usually by a ceremony, the bad effects that they are suffering because they have broken a religious or moral law