a-Large subgroup of Indo-European languages (language): a group of languages spoken in the region northeast of the Persian Gulf. It is a subgroup of the Indo-Iranian branch of Indo-European, and includes Baluchi, Kurdish, and Farsi. About 70 million people speak an Iranian language.
b-Somebody from Iran(people): Resident of Iran. Somebody who was born or raised in Iran, or who is a citizen of Iran. Persian.
c- of or pertaining to Iran, of Iranian origin.
d- Language of Iran