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

  

invariable

 adjective
adjective
BrE BrE//ɪnˈveəriəbl//
 
; NAmE NAmE//ɪnˈveriəbl//
 
 
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always the same; never changing synonym unchanging Her routine was invariable. his invariable courtesy and charm an invariable principle This is an invariable law: true at all times and places. compare variable Word Origin late Middle English: from French, or from late Latin invariabilis, from in- ‘not’ + variabilis (from variare, from varius ‘diverse’).
See the Oxford Advanced American Dictionary entry: invariable