Do you know the definition of the Holocaust?

Look in textbooks, in the dictionary, and you will find a myriad of different definitions - most of which are incomplete, and some are just plain inaccurate.

The United States Holocaust Memorial Museum, generally regarded as one of the authorities on the Holocaust, officially defines the Holocaust as:

The Holocaust was the state-sponsored, systematic persecution and destruction of European Jewish people by the Nazis and their collaborators between the years 1933-1945. While Jews were the primary target of Nazi hatred, the Nazis also persecuted and murdered Roma and Sinti (Gypsies), homosexuals, Jehovah’s Witnesses, Poles and people with disabilities. Six million Jews were murdered in the Holocaust. Of these 6 million, 1.5 million were children.

How do textbooks define the Holocaust? We'd love to know the definitions you find (and the sources in which you find them). Please considering sharing them here!