B1
an amount of money that is given back to you, especially because you are not happy with something you have bought
Dictionary examples:
The gym gave me a refund. Their weightlifting class was too light. (0.0)
I got a refund for my broken watch. It was about time! (0.0)
I got a refund for my broken time machine. It wasn't working tomorrow. (0.0)
The airline was responsible for the cancellation and we expect to get/receive a full refund. (51.3)