Caveat (noun)

1. A warning or qualification.
2. A legal notice to prevent certain actions without first giving notice.

Origin:

From latin caveat, third person singular present active subjunctive of cavere "to beware".

Examples:

1. The caveat in the fine print of the contract was overlooked by the buyer.
2. The caveat emptor principle holds that the buyer alone is responsible for checking the quality and suitability of goods before a purchase is made.
3. The lawyer advised his client to include a caveat in the will to protect the inheritance of the children.
4. The scientist released the findings with a caveat that more research needs to be done.
5. The real estate agent showed the property with the caveat that it needs some renovations.