Sui generis
In local government, a "sui generis" entity is one that does not fit with the general scheme of local governance of a country. For example in England, the City of London and the Isles of Scilly are the two "sui generis" localities, as their forms of local government are both (for historical or geographical reasons) very different from those of elsewhere in the country. 
In a press conference during which reporters were trying to analyse his political personality, Huey Long said, "...say that I am "sui generus", and let it go at that."
Code of Canons of the Eastern Churches
A church sui iuris is "a community of the Christian faithful, which is joined together by a hierarchy according to the norm of law and which is expressly or tacitly recognised as sui iuris by the supreme authority of the Church" (CCEO.27) . The term sui iuris is an innovation of CCEO (Codex Canonum Ecclesiarum Orientalium - Code of Canons of the Oriental Churches) and denotes the relative autonomy of the Oriental Catholic Churches. This canonical term, pregnant with many juridical nuances, indicates the God-given mission of the Oriental Catholic Churches to preserve their patrimonial autonomous nature. The autonomy of these churches is relative in the sense that they are under the authority of the Bishop of Rome.