The Collaborative International Dictionary of English v.0.48:

Latin \Lat"in\, n.
   1. A native or inhabitant of Latium; a Roman.
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   2. The language of the ancient Romans.
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   3. An exercise in schools, consisting in turning English into
      Latin. [Obs.] --Ascham.
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   4. (Eccl.) A member of the Roman Catholic Church.
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   Dog Latin, barbarous Latin; a jargon in imitation of Latin;
      as, the log Latin of schoolboys.

   Late Latin, Low Latin, terms used indifferently to
      designate the latest stages of the Latin language; low
      Latin (and, perhaps, late Latin also), including the
      barbarous coinages from the French, German, and other
      languages into a Latin form made after the Latin had
      become a dead language for the people.

   Law Latin, that kind of late, or low, Latin, used in
      statutes and legal instruments; -- often barbarous.
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WordNet (r) 3.0 (2006):

Late Latin
    n 1: the form of Latin written between the 3rd and 8th centuries
         [syn: Late Latin, Biblical Latin]