Tennessee Code Title 45. Banks and Financial Institutions § 45-2-2202

(1) “Assign” or “assignment” means a financial institution's policy, process, or practice that labels, links, or otherwise associates a firearms code with a merchant or a payment card transaction in a manner that allows the financial institution or another entity facilitating or processing the payment card transaction to identify whether a merchant is a firearms retailer or whether a transaction involves the sale of firearms or ammunition;

(2) “Customer” means an individual or entity engaged in a payment card transaction facilitated or processed by a financial institution;

(3) “Financial institution” means an individual or entity other than a merchant involved in facilitating or processing a payment card transaction, including a bank, savings and loan association, state credit union, state trust company, acquirer, payment card issuer, payment card network, payment gateway, or payment card processor;

(4) “Firearm”:

(5) “Firearms code” means a merchant category code approved by the International Organization for Standardization or an equivalent successor organization that is specifically assigned to a firearms retailer;

(6) “Firearms retailer” means an individual or entity that is lawfully engaged, from a physical place of business in this state, in selling or trading firearms, antique firearms, or ammunition to be used in firearms or antique firearms;

(7) “Government entity” means this state, a political subdivision of this state, or any court, agency, or instrumentality of this state;

(8) “Payment card” means a credit card, charge card, debit card, or another card that is issued to an authorized card user and allows the user to purchase goods or services from a merchant;  and

(9) “Payment card transaction” means a transaction in which a payment card is accepted as payment.