deflation
Pronunciation: /dɪˈfleɪʃ(ə)n/
noun
- 1the action or process of deflating or being deflated: the deflation of the illusion that the 1960s were a perpetual party

Origin:
late 19th century (in the sense 'release of air from something inflated'): from deflate; deflation (sense 3) via German from Latin deflat- 'blown away', from the verb deflare