From The Collaborative International Dictionary of English v.0.48:

Sabbatic \Sab*bat"ic\, Sabbatical \Sab*bat"ic*al\, a. [Gr. ?:
   cf. F. sabbatique.]
   Of or pertaining to the Sabbath; resembling the Sabbath;
   enjoying or bringing an intermission of labor.
   [1913 Webster]

   Sabbatical year (Jewish Antiq.), every seventh year, in
      which the Israelites were commanded to suffer their fields
      and vineyards to rest, or lie without tillage.
      [1913 Webster]
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