Punjab definitions

pŭn'jăb', pŭn-jäb'
A historical region of the northwest Indian subcontinent bounded by the Indus and Yamuna Rivers. It was a center of the prehistoric Indus Valley civilization and after c. 1500 bc the site of early Aryan settlements. Muslims occupied the western part of the region by the 8th century, introducing Islam, and although they later conquered the eastern part, Hinduism remained entrenched there. The Moguls brought the region to cultural eminence until their empire declined in the 18th century. The Punjab was controlled by Sikhs from 1799 to 1849, when it was annexed by Great Britain. It was partitioned between India and Pakistan in 1947.
Region in NW India & NE Pakistan, between the upper Indus & Jumna rivers: formerly a province of India, it was divided between India & Pakistan (1947); chief city, Lahore (now in Pakistan)
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A state of northwest India in the eastern part of the historical region of the Punjab. Chandigarh is the capital.
State of India, in this region: 19,445 sq mi (50,362 sq km); cap. Chandigarh.
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Origin of punjab

Hindi Panjāb, lit., (land of) five rivers < Sans panj, five + ab, river, water