1. An agreement to pay an existing debt, either one’s own or another’s, on a fixed day. • A constitutum was not a novation; the creditor could still sue the original debtor. It differed from a stipulation because it had to be for an existing debt. If the promise was to pay one’s own debt, it was called constitutum debiti proprii. If it was to pay another’s debt, then it was constitutum debiti alieni.
2. The fixing of a day for the repayment of money owed.