The Collaborative International Dictionary of English v.0.48:

Iranian \I*ra"ni*an\, a.
   Of or pertaining to Iran. -- n. A native of Iran; also, the
   Iranian or Persian language, a division of the Aryan family
   of languages, the modern version of which is called Farsi.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Iranian
    adj 1: of or relating to Iran or its people or language or
           culture; "Iranian mountains"; "Iranian security police"
           [syn: Iranian, Persian]
    n 1: a native or inhabitant of Iran; "the majority of Irani are
         Persian Shiite Muslims" [syn: Irani, Iranian,
         Persian]
    2: the modern Persian language spoken in Iran [syn: Iranian,
       Iranian language]