Sui generis
A similar case that led to the use of the label "sui generis" is the relationship of New Caledonia relative to France, because the legal status of New Caledonia can aptly be said to lie somewhere between a French overseas collectivity and a sovereign nation. Although other examples of such status for other dependent or disputed territories may exist, this arrangement is unique within the French realm.
South African family law
An engagement, which is an agreement "sui generis", is generally defined in the common law as "a legal agreement between a man and a woman to marry each other on a specific or determinable date." Despite the constitutional developments discussed previously, this definition remains in place today.Consensus is prevented, "inter alia", by mistake, misrepresentation, "metus" and undue influence.