Source : Webster's Revised Unabridged Dictionary (1913)

Arcadia \Ar*ca"di*a\, n. [L. Arcadia, Gr. ?.]
   1. A mountainous and picturesque district of Greece, in the
      heart of the Peloponnesus, whose people were distinguished
      for contentment and rural happiness.

   2. Fig.: Any region or scene of simple pleasure and
      untroubled quiet.

            Where the cow is, there is Arcadia.   --J.
                                                  Burroughs.

Source : WordNet®

Arcadia
     n : a department of Greece in the central Peloponnese