Dictionary.net

(fine arts) of or characteristic of a form or system felt to be of first significance before modern times

Belonging to ancient Greek and Latin authors of the first rank; resembling the pure and elegant literature of ancient Greece and Rome; of the first rank, especially in literature and the fine arts, so as to be academic and authoritative; pure; correct; refined; versed in the classics; pertaining to a class or classes.

Pert. to authors of the highest rank; chaste; pure; refined.

Of, or according to, the best authority; typically characterized. [Lat.]

Relating to to antique authors; of the first order or rank.