The Collaborative International Dictionary of English v.0.48:

Classic \Clas"sic\ (kl[a^]s"s[i^]k), Classical \Clas"sic*al\, a.
   [L. classicus relating to the classes of the Roman people,
   and especially to the frist class; hence, of the first rank,
   superior, from classis class: cf. F. classique. See Class,
   n.]
   1. Of or relating to the first class or rank, especially in
      literature or art.
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            Give, as thy last memorial to the age,
            One classic drama, and reform the stage. --Byron.
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            Mr. Greaves may justly be reckoned a classical
            author on this subject [Roman weights and coins].
                                                  --Arbuthnot.
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   2. Of or pertaining to the ancient Greeks and Romans, esp. to
      Greek or Roman authors of the highest rank, or of the
      period when their best literature was produced; of or
      pertaining to places inhabited by the ancient Greeks and
      Romans, or rendered famous by their deeds.
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            Though throned midst Latium's classic plains. --Mrs.
                                                  Hemans.
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            The epithet classical, as applied to ancient
            authors, is determined less by the purity of their
            style than by the period at which they wrote.
                                                  --Brande & C.
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            He [Atterbury] directed the classical studies of the
            undergraduates of his college.        --Macaulay.
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   3. Conforming to the best authority in literature and art;
      chaste; pure; refined; as, a classical style.
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            Classical, provincial, and national synods.
                                                  --Macaulay.
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   Classicals orders. (Arch.) See under Order.
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