Of Hebrew origin [H7676]; the Sabbath (that {is} {Shabbath}) or day of weekly repose from secular avocations (also the observance or institution itself); by extension a {se'nnight} that {is} the interval between two Sabbaths; likewise the plural in all the above applications: - sabbath ({day}) week.
From a derivative of σάττω sattō (to equip) meaning {furniture} especially a pack saddle (which in the East is merely a bag of netted rope); a seine for fishing: - net.