The Collaborative International Dictionary of English v.0.48:

Levitical \Le*vit"ic*al\ (l[-e]*v[i^]t"[i^]*kal), a. [L.
   Leviticus, Gr. Leyitiko`s.]
   1. Of or pertaining to a Levite or the Levites.
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   2. Priestly. " Levitical questions." --Milton.
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   3. Of or pertaining to, or designating, the law contained in
      the book of Leviticus. --Ayliffe.
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   Levitical degrees, degrees of relationship named in
      Leviticus, within which marriage is forbidden.
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WordNet (r) 3.0 (2006):

Levitical
    adj 1: of or relating to the book of Leviticus in the Bible