›to write a date on a document, especially a cheque, that is later than the date on which you are writing it: If you cannot trust the salesman to wait until the date on a cheque before presenting it, then post-dating it is pointless.We always pay our credit card bill by post-dated cheque for encashment on the due date.a postdated letter of resignation
›UKto make something such as a payment become effective at a later date: be post-datedThe company has a lot of orders that were postdated until January
›to happen or exist after something: The new terms and conditions, which postdate the time you used your card, state that if you make a charge in a currency other than sterling, that charge will be converted into sterling. → Comparebackdate