Noun

Perceived discrimination against the majority group, especially resulting from policies enacted to correct past discrimination. While such discrimination may be racially motivated, reverse discrimination is not the same as racism because the former is not institutionally enforced. 

Claims of reverse discrimination are often a reaction to attempts to correct policies and practices that have systemically oppressed populations (i.e., justice)

Source

UMass Medical and UMassMemorial Health Care’s Diversity + Inclusion, Diversity Toolkit