Let me know if this is close:

the political, economic, and social principles and policies advocated by Marx; especially: a theory and practice of socialism including the labor theory of value, dialectical materialism, the class struggle, and dictatorship of the proletariat until the establishment of a classless society.

Your right he missed the definition of marxist by a mile (he only got 7 out of 8), dialectical materialism is supposed to result in maximum efficiency. No way we are striving for any efficiency.