Wiktionary
n. The ideology which holds that the white race is superior to all others.
WordNet
n. the prejudice that members of the white race are superior to members of other races
Wikipedia
White supremacy or white supremacism is a racist ideology centered upon the belief, and promotion of the belief, that white people are superior in certain characteristics, traits, and attributes to people of other racial backgrounds and that therefore white people should politically, economically and socially rule non-white people.
The term is also typically used to describe a political ideology that perpetuates and maintains the social, political, historical and/or industrial domination by white people (as evidenced by historical and contemporary sociopolitical structures such as the Atlantic slave trade, Jim Crow laws in the United States, and apartheid in South Africa). Different forms of white supremacism put forth different conceptions of who is considered white, and different white supremacists identify various racial and cultural groups as their primary enemy. White supremacist groups have typically opposed people of color, immigrants, Jews, and Catholics.
In academic usage, particularly in usage drawing on critical race theory, the term "white supremacy" can also refer to a political or socio-economic system where white people enjoy a structural advantage ( privilege) over other ethnic groups, both at a collective and an individual level.
Usage examples of "white supremacy".
Either both the Negro and the white man would have to accept the fact and even justification of white supremacy--then they could talk about what the white folks were doing and thinking and what the Negroes were taking and aping.
Dear Friend - I write to you as one who has already supported some of my ventures dedicated to Justice, Right and the Natural Law of White Supremacy.
Charles Gregory Doblin tells a lifelong hatred for black people that became ever more obsessive as he became an adult: the brief involvement with the Klan and the Brotherhood of Aryan Nations before bailing out of the white supremacy movement in the belief that they were all rhetoric and no action.
Some Indians have reacted to white supremacy by becoming Americanized, others by retreating into traditional Indianism.