A more thorough explanation:

Solutio is a term used in Roman law that means the performance of an obligation or satisfaction of a debt.

• When John paid his rent on time, he fulfilled his solutio to his landlord.
• After receiving the solutio from the debtor, the creditor was satisfied and the debt was considered paid.

These examples illustrate how solutio refers to the act of fulfilling an obligation or debt. In the first example, John's payment of rent is his solutio to his landlord's obligation to provide him with a place to live. In the second example, the debtor's solutio satisfies the creditor's obligation to receive payment for the debt owed.