A premarital agreement may also be called an antenuptial agreement.  The terms are synonymous.  Prenuptial or antenuptial agreements refer to a contract between two persons planning to marry which governs the rights and liabilities of the parties if they should happen to get divorced or in the event one spouse dies.  In short, a prenuptial agreement determines the rights of parties to property, responsibility for debt  and may even determine whether spousal maintenance (alimony) is paid.