American English

Definition of immutable adjective from the Oxford Advanced American Dictionary

 

immutable

 adjective
adjective
NAmE//ɪˈmyut̮əbl//
 
(formal)
 
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that cannot be changed; that will never change synonym unchangeable This decision should not be seen as immutable.
immutability
 
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NAmE//ɪˌmyut̮əˈbɪlət̮i//
 
noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: immutable