REFUND - [noun] money that is given back to you, when you're not satisfied with the product or service that you buy
Examples of use
I took the computer back to the shop and I was given a refund.
I was not satisfied with the journey, so the travel agency decided to give me 50% refund.
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English speaking practise
Remember that if you don't use that word in English conversations or writing you'll forget it in a short time. So the best thing you can do to learn this word is just trying to use it in speaking or writing. Remember also that practise is the key to fluent english speaking.
You can always find a partner, who would also like to improve his/her