That part of the Indian subcontinent administered by the British from 1765, when the East India Company acquired control over Bengal, until 1947, when India became independent and Pakistan was created. By 1850 British India was coterminous with India's boundaries in the west and north and by 1885 it included Burma in the east. The period of British rule was known as the Raj.
Definition of British India in US English:
British India
proper noun
That part of the Indian subcontinent administered by the British from 1765, when the East India Company acquired control over Bengal, until 1947, when India became independent and Pakistan was created.