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

  

demonstrable

 adjective
adjective
BrE BrE//dɪˈmɒnstrəbl//
 
, also BrE//ˈdemənstrəbl//
 
; NAmE NAmE//ˈmɑːnstrəbl//
 
(formal)
 
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that can be shown or proved a demonstrable need There is no demonstrable link between the two events. Word Origin late Middle English: from Latin demonstrabilis, from demonstrare ‘point out’.
See the Oxford Advanced American Dictionary entry: demonstrable