3. In this Regulation, unless the context indicates otherwise,
(a) “acceptance” means a notice issued and dated that is affixed to a delivery note or to any other document of the same nature in replacement of such note, for the purpose of acknowledging that goods were delivered, a service rendered or work carried out in accordance with the conditions provided for in a contract or the fact of taking possession of or using the goods or services offered by a supplier;
(b) “contract” means a document containing all the clauses relative to the rights, obligations and responsibilities of the parties for the purposes of fulfilling the objectives explicitly defined therein;
(c) “interest” means the value or sum of money paid for the overdue payment of a debt;
(d) “day” means a calendar day;
(e) “supplier” means a natural person doing business alone under his own name or a firm name, a partnership or a legal person with whom or which the Government has made a contract or verbal agreement to obtain goods or services;
(f) “payment period” means the period comprised between the date on which the bill was received or the date of the acceptance, whichever is later, and the date on which a payment is issued;
(g) “bill” means a document determined in accordance with a contract or verbal agreement, by a supplier or a Department, relative to determining the amount of a debt following the full or partial execution of the contract.