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."
Eugenics
Eugenics (; from Greek εὐγενής "eugenes" 'well-born' from εὖ "eu", 'good, well' and γένος "genos", 'race, stock, kin') is a set of beliefs and practices that aims at improving the genetic quality of a human population by excluding (through a variety of morally criticized means) certain genetic groups judged to be less desirable and promoting other genetic groups judged to be superior. The exact definition of "eugenics" has been a matter of debate since the term was coined by Francis Galton in 1883. The concept predates this coinage, with Plato suggesting applying the principles of selective breeding to humans around 400 BCE.