Definitions of Tajik:

noun: an ethnic group (mostly Moslem) living in Tajikistan and neighboring areas of Uzbekistan and Afghanistan and China
noun: a native or inhabitant of Tajikistan and neighboring areas of Uzbekistan and Afghanistan and China
noun: the Iranian language of the Tajik people that is closely related to Farsi; spoken in Iran and Tajikistan
noun: a landlocked mountainous republic in southeast central Asia north of Afghanistan; formerly an Asian soviet