Definition of mutable adjective from the Oxford Advanced Learner's Dictionary

 

mutable

 adjective
adjective
BrE BrE//ˈmjuːtəbl//
 
; NAmE NAmE//ˈmjuːtəbl//
 
(formal)
 
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that can change; likely to change Word Origin late Middle English: from Latin mutabilis, from mutare ‘to change’.
See the Oxford Advanced American Dictionary entry: mutable