Genocide - Deliberate and systematic destruction of a racial, political, or cultural group.

From the word genus (race) and (cide), killing. Coined by Raphael Lemkin, a Russian Jewish jurist, in 1944, it refers to the intentional, systematic murder of all of the people in a targeted group. The 20th century is one of recurrent genocide including the Armenians in World War I, the Jews during World War II, and post-1945, genocides took place in many areas including Cambodia, Rwanda, Guatemala and the former Yugoslavia.

Genocide has been defined as the deliberate killing of people based on their ethnicity, nationality, race, religion, or (sometimes) politics, as well as other deliberate action(s) leading to the physical elimination of any of the above categories.