Source : Webster's Revised Unabridged Dictionary (1913)

Iran \I`ran"\ ([=e]`r[aum]n"), n. [Mod. Persian Ir[=a]n. Cf.
   {Aryan}.]
   The native name of Persia.

Source : WordNet®

Iran
     n : a theocratic islamic republic in the Middle East in western
         Asia; Iran was the core of the ancient empire that was
         known as Persia until 1935; rich in oil; involved in
         state-sponsored terrorism [syn: {Islamic Republic of Iran},
          {Persia}]