Special delivery is post guaranteed to arrive by a stated time. Pay for special delivery.
The guarantee means the postage is refunded if it is late, not the value of the thing. Special delivery is what passports and legal papers travel by.
1nounspecial deliveryPost guaranteed to arrive by a stated time.
“Special delivery got it there by one o'clock the next day.”
special delivery is a service.
Practised in Bank & Post Office