Definitions for "Rolling Settlement"
an account period for transactions in securities on the Stock Exchange where trades are settled on the fifth day
A structure in which transactions are settled a fixed number of days after execution (for example, "transaction date + 3 days" or "T+3") rather than on a fixed calendar date (such as the third Thursday of every month).
The principle that a share transaction has to be settled a fixed number of business days after the deal has been done i.e. cash or stock must be received before the agreed settlement date. (see Settlement)