IPA: /dɪsɪˈluːʒən/
KK: /dɪsɪˈluːʒən/
The state of being disappointed because something is not as good as you believed it to be.
After learning the truth about the company, she felt a deep sense of disillusion.
To make someone realize that something they believed was true is actually false or not as good as they thought.
The harsh reality of the situation disillusioned him about his dreams of becoming a famous actor.
Past: disillusioned
Past Participle: disillusioned
Disillusion is formed from "dis-" (meaning apart or away) and "illusion" (from Latin "illudere", meaning to mock or deceive). The word describes the process of being freed from a false belief or deception, thus separating oneself from an illusion.
Think of being 'freed from' ('dis-') a 'deception' ('illusion') — that's what disillusion means.