1. (n.) The doctrine that genera and species are real things or entities, existing independently of our conceptions\. According to realism the Universal exists ante rem (Plato), or in re (Aristotle).

2. (n.) As opposed to idealism, the doctrine that in sense perception there is an immediate cognition of the external object, and our knowledge of it is not mediate and representative.

3. (n.) Fidelity to nature or to real life; representation without idealization, and making no appeal to the imagination; adherence to the actual fact.

Marxism absolute realism animalism artlessness atomism authenticity behaviorism bona fideness commonsense realism dialectical materialism down-to-earthness earthiness earthliness empiricism epiphenomenalism freedom from illusion genuineness hardheadedness health historical materialism honesty hylomorphism hylotheism hylozoism inartificiality lack of feelings legitimacy lifelikeness literalism literality literalness materialism matter-of-factness mechanism natural realism naturalism naturalness naturism new realism normalcy normality normalness order photographic realism physicalism physicism positive philosophy positivism practical-mindedness practicality practicalness pragmaticism pragmatism propriety rationality realness reasonableness regularity representative realism saneness scientism secularism sensibleness sincerity sober-mindedness substantialism temporality true-to-lifeness truth to nature unadulteration unaffectedness unfictitiousness unidealism unromanticalness unsentimentality unspeciousness unspuriousness unsyntheticness verisimilitude wholesomeness worldliness