Definition (Personal Attempt): Dialectic

This word is found in the footnote on page 206: "It points to an essential aspect of the dialectical theory of society."

Horkheimer is using the term to explain his idea of "critical" activity, and therefore describes the latter part of the essay about critical theory - Marx's ideas. From the word itself, "di," I would assume, means two. So the word in some sense indicates a two sided theory, one with or about an internal argument or conflict. Perhaps it is refering to the seperation between the indiviual and society? Between the good of the individual and the good of the whole?