/ dɪˈmɒnstrəbl; NAmE -ˈmɑːn- BrE also ˈdemənstrəbl/ adjective
( formal ) that can be shown or proved :
a demonstrable need
► dem·on·strably / -bli; NAmE / adverb :
demonstrably unfair
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WORD ORIGIN
late Middle English : from Latin demonstrabilis , from demonstrare point out.