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."
Svecchamrityu (Iccha-mrityu)
Svecchamrityu (Sanskrit: स्वेच्छामृत्यु) {Sva (self) + iccha (will) + mrityu (death)} is an adjective which means - having death at one’s own power or dying at one’s own will It is also called Iccha-mrityu (इच्छा मृत्यु) meaning self-willed death but it is not to be confused with immortality or self-inflicted death. Shantanu had granted to his son Gangaputra Devavrata, also known as Bhishma, the supernatural power of Svecchamrityu. Mahabharata records that Bhishma did choose the time and manner of his own death.