There are multiple definitions - click on the translation that matches your context.
restitution means:
Substantiv
partial
noun
Inasmuch as Rückabwicklung is often used in an informal, non-legal context, the term restitution is suitable for conveying the process of unwinding the previous steps taken, specifically the process of returning things to how it was at the outset.
the act of giving something back that was lost or taken unlawfully from someone; the act of compensating the consequences of unlawful loss or injury
My client demands full restitution of expenses incurred (=money spent) following your breach of contract.