treatmenttreat·ment /ˈtriːtmənt/ noun1[countableC, uncountableU] a particular way of dealing with someone or somethingThe range of permissibleaccounting treatments is amazingly broad.
The investigation found that some contractors receivedpreferential treatment (=were given an unfair advantage).
2[uncountableU] a process by which something is protected, cleaned, or made safean organic waste treatment plant