Intersectionality, coined by legal scholar Kimberle Crenshaw in 1989, refers "to the complex and cumulative way that the effects of different forms of discrimination (such as racism, sexism, and classism) combine, overlap, and yes, intersect - especially in the experiences of marginalized people or groups." - definition from Meriam-Webster
For a more detailed explanation check out the Credo Reference section on Intersectionality