What is Bank Account?

Legal Definition
A bank account is a financial account maintained by a financial institution for a customer. A bank account can be a deposit account, a credit card account, or any other type of account offered by a financial institution, and represents the funds that a customer has entrusted to the financial institution and from which the customer can make withdrawals. Alternatively, accounts may be loan accounts in which case the customer owes money to the financial institution.

The financial transactions which have occurred within a given period of time on a bank account are reported to the customer on a bank statement and the balance of the accounts at any point in time is the financial position of the customer with the institution.

The laws of each country specify the manner in which accounts may be opened and operated. They may specify, for example, who may open an account, how the signatories can identify themselves, deposit and withdrawal limits and many other matters.
-- Wikipedia
Legal Definition
A sum of money placed with a bank or banker, on deposit, by a customer, and subject to be drawn out on the latter's check. The statement or computation of the several sums deposited and those drawn out by the customer on checks, entered on the books of the bank and the depositor's pass-book. Gnie v. Drake, 51 N. H. 84.
-- Black's Law Dictionary
Legal Definition
The funds of a bank from which a depositor may draw. See 51 N. H. 78.
-- Ballentine's Law Dictionary