The part of the former Indian province of Bengal that was ceded to Pakistan in 1947, forming the greater part of the province of East Pakistan. It gained independence as Bangladesh in 1971.
Definition of East Bengal in US English:
East Bengal
proper noun
The part of the former Indian province of Bengal that was ceded to Pakistan in 1947 and that forms the greater part of the province of East Pakistan. It gained independence as Bangladesh in 1971.