Etymology of the English word sabbatical
the English word sabbatical
derived from the Late Latin word sabbaticus
derived from the Greek word sabbatikos
derived from the Greek word sabbaton, σάββατον (the Sabbath (Shabbath), or day of weekly repose from secular avocations (also the observance or institution itself); by extension, a se'nnight; the interval between two Sabbaths; likewise the plural in all the above applications)
derived from the Hebrew word shabbat