Subjectivism the doctrine of Kant that all human knowledge is merely relative, or, rather, that we cannot prove it to be absolute. According to him we cannot objectify the subjective; that is, we cannot prove that what appears true to us must appear true to all intelligent beings; or that, with different faculties, what now appears true to us might not appear untrue. But to call our knowledge relative is merely calling it human, or proportioned to the faculties of a man; just as the knowledge of angels may be called angelic.. Our knowledge may be admitted to be relative to our faculties of apprehending it; but that does not make it less certain. See Fleming, Vocab. of Philosoph. Science, s.v.