The term 'waiting list' can be summarized as a list of people or ORDERS that are waiting to be fulfilled. This list is typically used when there is a limited supply of something, such as tickets for an event or a product that is in high demand. People or ORDERS on the list will be served in the order they were added, and those at the top of the list will be served first. The crossword solution for this term is 'ORDERS', which refers to the ORDERS that are placed on the waiting list.