An Etymological Dictionary of the German Language/Seite
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Seite, f., ‘side, flank, page,’ from MidHG. sîte, sît, OHG. sîta (sîtta), f., ‘side’; comp. Du. zijde, f., ‘side,’ and the equiv. AS. sîde, E. side, OIc. síða, f.; Goth. *seidô (*seidjô), f., is wanting. Allied to OIc. síðr, ‘hanging down,’ AS. sîd, adj., ‘wide, large, extended’? — seits, in einerseits, ander-, jenseits, &c., with adv. s from MidHG. -sît in einsît, ander-sît, jënsît, which are accus. advs.