Purification is the process of making something pure — taking out dirt, germs, or anything harmful, especially from water, air, or other substances. It's a fairly big, formal word, used in science and technical writing, like 'water purification' at a treatment plant. It's also used for religious or spiritual ceremonies meant to make a person clean in a symbolic way, for example using water, fire, or incense.

淨化（水、空氣等）；也可指宗教上的潔淨儀式。