Can't give you a proper definition (if it exists) but I do see a parallel between the idea of a society shaped by economic class struggles (which will eventuall

Can't give you a proper definition (if it exists) but I do see a parallel between the idea of a society shaped by economic class struggles (which will eventually end with a defeat of the current dominant class by the currently oppressed class) and the idea of a society divided in identitarian classes (white, black, man, woman, straight, gay, trans, etc.), and an ongoing struggle between oppressors and oppressed classes. In fact it seems pretty reasonable to infer that identity politics is a descendant- transformed, but still recognisable- of a marxist analysis of society.