The Collaborative International Dictionary of English v.0.48:

Saturnian \Sa*tur"ni*an\, a. [L. Saturnius.]
   1. (Roman Myth.) Of or pertaining to Saturn, whose age or
      reign, from the mildness and wisdom of his government, is
      called the golden age.
      [1913 Webster]

   2. Hence: Resembling the golden age; distinguished for
      peacefulness, happiness, contentment.
      [1913 Webster]

            Augustus, born to bring Saturnian times. --Pope.
      [1913 Webster]

   3. (Astron.) Of or pertaining to the planet Saturn; as, the
      Saturnian year.
      [1913 Webster]

   Saturnian verse (Pros.), a meter employed by early Roman
      satirists, consisting of three iambics and an extra
      syllable followed by three trochees, as in the line: --
      Th[e^] qu[=e]en | w[a^]s [imac]n | th[e^] k[imac]tch |
      [e^]n [=e]at[i^]ng | br[=e]ad [a^]nd | h[=o]n[e^]y.
      [1913 Webster]