From Middle English iwis, iwys, ywis ("certain, sure"), from Old English ġewiss ("certain, sure"), from Proto-West Germanic *gawiss, from Proto-Germanic *gawissaz ("known, certain, sure"), from Proto-Indo-European *weyd- ("to know").
Cognate with Dutch gewis ("sure"), German gewiss ("certain"), Danish vis ("sure"). More at wit, wis.
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