1.  A Banker includes a person or corporation or company acting as a Banker.” – Negotiable Instrument Act, 1881
2. Banker includes a body of persons where incorporate or not who carry on the business of Banking. – Bill of Exchange Act, 1882
3. ” A Banker is a dealer in debts-his  own and other peoples” – Prof. Crowther.
4. A banker or a bank is a person or company carrying on the  business of receiving money and collecting draft for customer subject to the obligation of honouring cheuques drawn upon them from time to time by the customer to the extent of the amounts available in their current account. –Proof. A. C. Hart.
5. Commercial Banker is dealer in money in substitutes for money, such as cheques or bill of exchange – New Encyclopedia Britanica