This is solely my opinion, and shared reasoning. I do not claim to speak for others.
Merriam Webster Definition:
Main Entry: rac·ism
Function: noun
Date: 1933
1: a belief that race is the primary determinant of human traits and capacities and that racial differences produce an inherent superiority of a particular race
2: racial prejudice or discrimination
Oxford Dictionary Definition:
Pronunciation: /ˈrāˌsizəm/noun
the belief that all members of each race possess characteristics or abilities specific to that race, especially so as to distinguish it as inferior or superior to another race or races. prejudice, discrimination, or antagonism directed against someone of a different race based on the belief that one's own race is superior
