IPA: /ˌdɛlɪdʒɪtəˈmeɪʃən/
KK: /dɛlɪdʒɪtəˈmeɪʃən/
The process of taking away the accepted status or authority of something, making it no longer considered valid or legitimate.
The delegitimation of the previous government led to widespread protests.
Delegitimation → It is formed from "de-" (meaning down or away) and "legitimus" (from Latin, meaning lawful or legitimate) and "-ation" (a suffix indicating a process or action). The word refers to the process of removing or undermining the legitimacy of something.
Think of 'removing' ('de-') the 'lawfulness' ('legitimus') of something — that's why delegitimation means to take away its legitimacy.