Source : Webster's Revised Unabridged Dictionary (1913)

Augustan \Au*gus"tan\, a. [L. Augustanus, fr. Augustus. See
   {August}, n.]
   1. Of or pertaining to Augustus C[ae]sar or to his times.

   2. Of or pertaining to the town of Augsburg.

   {Augustan age} of any national literature, the period of its
      highest state of purity and refinement; -- so called
      because the reign of Augustus C[ae]sar was the golden age
      of Roman literature. Thus the reign of Louis XIV. (b.
      1638) has been called the Augustan age of French
      literature, and that of Queen Anne (b. 1664) the Augustan
      age of English literature.

   {Augustan confession} (Eccl. Hist.), or confession of
      Augsburg, drawn up at Augusta Vindelicorum, or Augsburg,
      by Luther and Melanchthon, in 1530, contains the
      principles of the Protestants, and their reasons for
      separating from the Roman Catholic church.

Source : WordNet®

Augustan
     adj : relating to or characteristic of the times of the Roman
           emperor Augustus; "the Augustan Age"