Postage paid refers to a postal item that has already had postage paid for it, before it is sent. This is a useful feature that can save time and money. There are several synonyms that can be used instead of postage paid, including prepaid, franked, pre-stamped, and pre-paid. These terms are often used interchangeably and mean essentially the same thing - that the item has already been paid for before it is sent. Prepaid and pre-paid are the simplest and most straightforward synonyms for postage paid and are often used in situations where clarity is important, such as in business dealings. Franked and pre-stamped are less commonly used, but still carry the same meaning.