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 verb (proved; proved or proven; proving) see:  pro-  
 Date: 13th century
 transitive  verb to learn or find out by experience, 
 
 2. to test the truth, validity, or genuineness of , to test the worth or quality of, to check the correctness of (as an arithmetic result), 
 
 3. to establish the existence, truth, or validity of (as by evidence or logic) , to demonstrate as having a particular quality or worth , to show (oneself) to be worthy or capable , intransitive  verb to turn out especially after trial or test , provable  adjective provableness  noun provably  adverb prover  noun 
 Usage: The past participle proven, originally the past participle of preve, a Middle English variant of prove that survived in Scotland, has gradually worked its way into standard English over the past three and a half centuries. It seems to have first become established in legal use and to have come only slowly into literary use. Tennyson was one of its earliest frequent users, probably for metrical reasons. It was disapproved by 19th century grammarians, one of whom included it in a list of “words that are not words.” Surveys made some 50 or 60 years ago indicated that proved was about four times as frequent as proven. But our evidence from the last 30 or 35 years shows this no longer to be the case. As a past participle proven is now about as frequent as proved in all contexts. As an attributive  adjective  proven is much more common than proved.

 prove out 
 intransitive  verb 
 Date: 1941
 to turn out to be satisfactory or as expected