Privilege plus power. If we can't agree on a definition, substitute my word for another that more closely fits the meaning. I don't care to bicker about definitions, but I hope we can both know what is meant.
This is one of the uppermost citations on the Wikipedia page for the term.
"Marginal immunity" is also looking at it the wrong way. One should instead consider how a nonwhite person would be treated in the same situation. Let alone any incident involving the police in the US.
If you think racism can’t be applied to some people because they have magical immunity due to their skin color, you’re a racist.