Metaphysically, postmodernism is anti-realist, holding that it is impossible to speak meaningfully about an independently existing reality. Postmodernism substitutes instead a social-linguistic, constructionist account of reality. Epistemologically, having rejected the notion of an independently existing reality, postmodernism denies that reason or any other method is a means of acquiring objective knowledge of that reality. Having substituted social-linguistic constructs for that reality, postmodernism emphasizes the subjectivity, conventionality, and incommensurability of those constructions. Postmodern accounts of human nature are consistently collectivist, holding that individuals’ identities are constructed largely by the social-linguistic groups that they are a part of, those groups varying radically across the dimensions of sex, race, ethnicity, and wealth. Postmodern accounts of human nature also consistently emphasize relations of conflict between those groups; and given the de-emphasized or eliminated role of reason, postmodern accounts hold that those conflicts are resolved primarily by the use of force, whether masked or naked; the use of force in turn leads to relations of dominance, submission, and oppression. Finally, postmodern themes in ethics and politics are characterized by an identification with and sympathy for the groups perceived to be oppressed in the conflicts, and a willingness to enter the fray on their behalf.
The term “post-modern” situates the movement historically and philosophically against modernism. Thus understanding what the movement sees itself as rejecting and moving beyond will be helpful in formulating a definition of postmodernism.