sabbath: [OE] The sabbath is etymologically the day of ‘rest’. The word comes ultimately from Hebrew shabbāth, a derivative of shābath ‘rest’. English acquired it via Greek sábbaton and Latin sabbatum. The modern use of the derived sabbatical [16] for a ‘period away from normal duties’, first recorded in the 19th century, evolved from its original application to the one year in seven when, according to ancient Jewish law, land had to be left fallow. French samedi ‘Saturday’ comes from the same source. => sabbatical[sabbath etymology, sabbath origin, 英语词源]