An act of filling a container again. The waiter offered a refill of water to the guests.
A replacement supply of a consumable item, such as ink or medication, that is used to replenish the original container. She bought a refill for her fountain pen.
A second or subsequent filling of a drink, especially in a restaurant or bar. He asked for a refill of his coffee.
An additional supply of medication authorized to be dispensed again under a prescription. The pharmacist told her she had two refills remaining on her prescription.