What is meant by pakistan?

The Cambridge student and Muslim nationalist Choudhary Rahmat Ali coined the name in 1933. It is an acronym comprising letters from names of ethnic populations inhabiting the region. 

 
• Punjab 
• Afghania (Ali's preferred name for the North West Frontier Province) 
• Kashmir 
• Sindh 
• stan from Balochistan, thus forming "Pakstan". 
• An "I" introduced later to ease pronunciation. 
• The suffix, stan, also holds secondary significance -- in Persian it means "home of" and in Sanskrit it means "place" of.

  He later expanded upon this (in an updated listing) in his 1947 book, Pakistan: The Fatherland of the Pak Nation. In that book he altered slightly and then re-explained the acronym as follows: 

 
• Punjab 
• Afghania 
• Kashmir 
• Indus Valley 
• Sindh 
• Turkharistan (roughly the modern central-Asian states), 
• Afghanistan (not Afghania)   
• N as in BalochistaN. 
• Here again, the Persian word پاک pāk, which means "pure", adds another shade of (double) meaning, with the full word, Pakistan, thus also meaning "land of the pure".