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() From Middle English proven, from Old English prōfian (“to esteem, regard as, evince, try, prove”), from Late Latin probō (“to try, test, approve”, verb), from probus (“good, worthy”), from Proto-Indo-European *pro-bhwo- (“being in front, prominent”), from Proto-Indo-European *pro-, *per- (“toward”) + Proto-Indo-European *bhu- (“to be”). More at for, be.