realism, In philosophy, any viewpoint that accords to the objects of human knowledge an existence that is independent of whether they are being perceived or thought about. In the metaphysical debate concerning universals, realism is opposed to nominalism, which denies that universals have any reality at all (except as words), and to conceptualism, which grants universals reality but only as concepts in the mind. Against idealism and phenomenalism, realism asserts the independent existence of material objects and their qualities. Similarly, moral realism holds that the moral qualities of things and actions (such as being good or bad, right or wrong) belong to the things or actions themselves and are not to be explained in terms of the subject’s feelings of approval or disapproval. In opposition to conventionalism, realism holds that scientific theories are objectively true (or false) based on their correspondence (or lack of it) to an independently existing reality.
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