egoism in a sentence

Postmodernism is a broad movement that developed in the mid- to late-20th century across philosophy, the arts, architecture, and criticism and that marked a departure from modernism. The term has also more generally been applied to the historical era following modernity and the tendencies of this era.
While encompassing a disparate variety of approaches, postmodernism is defined by its rejection of grand narratives/meta-narratives and ideologies. Consequently, common targets of postmodern critique include universalist notions of objective reality, morality, truth, human nature, reason, language, and social progress. Postmodern thinkers frequently call attention to the contingent or socially-conditioned nature of knowledge claims and value systems, situating them as products of particular political, historical, or cultural discourses and hierarchies. Accordingly, postmodern thought is broadly characterized by tendencies to self-referentiality, epistemological and moral relativism, pluralism, subjectivism, and irreverence.
Postmodern critical approaches gained purchase in the 1980s and 1990s, and have been adopted in a variety of academic and theoretical disciplines, including cultural studies, philosophy of science, economics, linguistics, architecture, feminist theory, and literary criticism, as well as art movements in fields such as literature and music. Postmodernism is often associated with schools of thought such as deconstruction and post-structuralism, as well as philosophers such as Jean-François Lyotard, Jacques Derrida, and Fredric Jameson, though many so-labeled thinkers have criticized the term.

see more at wikipedia