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dis·il·lu·sion / ˌdisəˈloōzhən/ • n. disappointment resulting from the discovery that something is not as good as one believed it to be: enthusiasm for the government evaporated into a more cynical disillusion.• v. [tr.] cause (someone) to realize that a belief or an ideal is false: if they think we have a magic formula to solve the problem, don't disillusion them.