IPA: /ˌdiːkɒntəˈmeɪʃən/
KK: /diˌkɒntəˈmeɪʃən/
The process of cleaning or removing harmful substances or germs from a person, object, or area.
The team performed decontamination on the affected area to ensure safety.
Decontamination → It is formed from "de-" (meaning removal or reversal) and "contaminare" (from Latin, meaning to make impure or to pollute) and "-tion" (meaning the action or process of). The word "decontamination" refers to the process of removing contamination or impurities.
Think of 'removing' ('de-') something that 'pollutes' ('contaminare') — that's why decontamination means the process of cleaning away impurities.