IMMUTABILITY Meaning of IMMUTABILITY in English immutability BrE AmE ɪ ˌmjuːt ə ˈbɪl ət i ˌɪˌ•-, ˌɪmˌ•-, -ɪt i AmE \ -ˌmjuːt̬ ə ˈbɪl ət̬ i Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012