a branch of the Indo-European family of languages, divided into West Iranian (including Old Persian, Pahlavi, modern Persian, Kurdish, Baluchi, and Tajik) and East Iranian (including Avestan, Sogdian, Pashto, and Ossetic)
3.
Persian, Also: Farsi the modern Persian language
—adj
4.
relating to, denoting, or characteristic of Iran, its inhabitants, or their language; Persian
5.
belonging to or relating to the Iranian branch of Indo-European