Hin·du·sta·ni / ˌhindoōˈstänē/ • n. a group of Indic dialects spoken in northwestern India, principally Hindi and Urdu. ∎  the Delhi dialect of Hindi, widely used throughout India as a lingua franca.• adj. of or relating to the culture of northwestern India: Hindustani classical music.

Hindustani Member of the Indo-Iranian branch of Indo-European languages, closely related to Hindi and Urdu. More than 300 million people are thought to speak or understand Hindustani in India and Pakistan.