To order something; to submit an order for a product.

Alternative spelling of out of order

(business) A commercial document issued by a buyer to a seller, indicating the type, quantities and agreed prices for products or services the seller will provide to the buyer.

(mathematics) Synonym of well-order

present participle of well-order

(set theory, order theory) A total order of some set such that every nonempty subset contains a least element.

(set theory, order theory, transitive) To impose a well-order on (a set).

(management) An authorization to expend resources to perform a task.

(US, military) A order initiating a military operation.

(computing theory) Alternative spelling of postorder