Which term refers to the process of cleansing impurities?

The term "purgation" specifically denotes a process that involves cleansing or purging impurities from something, often used in medicinal or ritual contexts. It carries connotations of purification, where unwanted substances are expelled, leaving behind something that is considered clean or pure. This term is not just synonymous with general removal; it implies a thorough process aimed at achieving a significant degree of cleanliness or purity.

In contrast, other options like elimination and clearing may encompass broader meanings that don't necessarily focus solely on the concept of cleansing, while filtering tends to suggest a method of separation based on size or substance rather than a thorough purging of impurities. Thus, purgation is the most precise term for describing the process of cleansing impurities.