What is Order Fulfillment?

Legal Definition
Order fulfillment (in British English order fulfilment) is in the most general sense the complete process from point of sales inquiry to delivery of a product to the customer. Sometimes Order fulfillment is used to describe the more narrow act of distribution or the logistics function, however, in the broader sense it refers to the way firms respond to customer orders.
-- Wikipedia
Legal Definition
All the stages involved in processing an order to the customer's satisfaction, including inventory alterations, processing returns and readjusting records.