Proviso (noun)

1. A provision or stipulation in a contract, agreement, or law that qualifies or limits the main clause.
2. A condition or qualification that must be met before something can happen.

Origin:

From latin proviso, from the gerundive provisus "provided", from providere "to provide".

Examples:

1. The contract had a proviso that the work must be completed within a certain time frame.
2. The agreement had a proviso that the company would not be held liable for any damages.
3. The law included a proviso that the new regulations would not be applied retroactively.
4. The loan had a proviso that the borrower must have a certain credit score.
5. The agreement had a proviso that the seller would provide a warranty for the goods.