IPA: /ˌfjuːmɪˈɡeɪʃən/
KK: /fjuˈmɪɡeɪʃən/
The process of using smoke or vapor to disinfect or purify an area, often to eliminate pests or harmful organisms.
The fumigation of the building was necessary to remove the termites that had infested it.
Fumigation → It is formed from "fumigare" (meaning to smoke) and the suffix "-tion" (indicating the action or process). The word "fumigation" refers to the process of using smoke or vapor to disinfect or purify an area.
Think of the word 'fumigate' which means to use smoke for cleaning or disinfecting — that's why fumigation is the action of using smoke.