In considering patriarchy as potentially institutional and as a characteristic also of contemporary Western societies, a fundamental issue concerns how to make sense of largely informal institutions to begin with. Traditional accounts of institutions have often focused on formalized ones. It is argued here, however, that the principal idea behind one commonly accepted conception of institutions can be developed in a way that better facilitates an explication of informal institutions. When applied to the phenomenon of patriarchy, such an approach can then also allow us to ontologically make sense of gray areas and hierarchies of authority, as well as the intersectionality of social positions.