Sure, here’s the meaning of the word “refund”:

refund:

• To give back money that has been paid, usually as a result of a mistake or as a refund of a deposit.
• To reimburse someone for money they have spent.

Here are some examples of how the word “refund” is used:

• The store offered a full refund to the customer who was dissatisfied with the product.
• The bank refunded the customer’s money after they had been charged mistakenly.
• The government offered a refund to people who had paid income taxes in error.

I hope this definition is helpful.