What is Cashier?

Legal Definition
A retail cashier or simply a cashier is a person who handles the cash register at various locations such as the point of sale in a retail store. The most common use of the title is in the retail industry, but this job title is also used in the context of accountancy for the person responsible for receiving and disbursing money or within branch banking in the United Kingdom for the job known in the United States as a bank teller.
-- Wikipedia
Legal Definition
An officer of a moneyed institution, who is entitled by virtue of his office to take care of the cash or money of such institution.

2. The cashier of a bank is usually entrusted with all the funds of the bank, its notes, bills, and other choses in action, to be used from time to time for the ordinary and extraordinary exigencies of the bank. He usually receives directly, or tbrough subordinate officers, all moneys and notes of the bankdelivers up all discounted notes and other securities, when they have been paid draws checks to withdraw the funds of the bank where they have been deposited; and, as the executive officer of the bank, transacts much of the business of the institution. In general, the bank is bound by the acts of the cashier within the scope of his authority, expressed or implied. 1 Pet. R. 46, 70Wheat. R. 300, 361 5 Wheat. R. 326; 3 Mason's R. 505; 1 Breese, R. 45; 1 Monr. Rep. 179. But the bank is not bound by a declaration of the cashier, not within the scope of his authority; as when a note is about to be discountedby the bank, he tells a person that he will incur no risk nor responsibility by becoming an endorser upon such note. 6 Pet. R. 51; 8 Pet. R. 12.Vide 17 Mass. R. 1 Story on Ag. 114, 115; 3 Halst. R. 1; 12 Wheat. R. 183; 1 Watts & Serg. 161.
-- Bouviers Law Dictionary
Legal Definition
Punishment. To break; to deprive a military man of his office. Example: every officer who shall be convicted, before a general court martial, of leaving signed a false certificate relating to the absence of either officer or private soldier, or relative to his daily pay, shall be, cashiered. Articles of war, art. 14.
-- Bouviers Law Dictionary
Legal Definition
n. An officer of a moneyed Institution or commercial house or bank, who is entrusted with, and whose duty it is to take care of, the cash or money of such institution or bank. The cashier of a bank is the executive officer, through whom the whole financial operations of the bank are conducted. He receives and pays out its moneys, collecte and pays its debts, and receives and transfers its commercial securities. Tellers and other subordinate officers may be appointed, but they are under his direction, and are, as it were, the arms by which designated portions of his various functions are discharged. The directors may limit his authority as they deem proper, but this would not afEect those to whom the limitation was unknown. Merchants' Nat. Bank v. State Nat. Bank, 10 Wall. 650, 19 L. Ed. 1008.
-- Black's Law Dictionary
Legal Definition
v. In military law. To deprive a military officer of his rank and office.
-- Black's Law Dictionary
Legal Definition
The manager of a bank.
-- Ballentine's Law Dictionary