IPA: /ɪˌliːɡəlaɪˈzeɪʃən/
KK: /ɪˌliːɡəlaɪˈzeɪʃən/
The act of making something illegal or prohibiting it by law.
The illegalization of certain substances has led to a decrease in their use.
Illegalization → It is formed from "il-" (meaning not), "legal" (from Latin "legalis", meaning lawful), and "-ization" (meaning the process of making). The word refers to the process of making something not lawful or illegal.
Think of 'not' ('il-') making something 'lawful' ('legal') into a process of making it 'not lawful' — that's what illegalization means.