region in N India, between the Vindhya Mountains & the Himalayas, where Hindi is spoken
the entire Indian subcontinent
the republic of India
See Hindustan in American Heritage Dictionary 4
A historical region of India considered at various times to include only the upper Ganges River plateau or all of northern India from the Himalaya Mountains to the Deccan Plateau and from the Punjab to Assam. The term has also been applied to the entire Indian subcontinent.