Sentence:  The most famous definition of <WSD>postmodernism</WSD> is Lyotard's: “I define "postmodern" as incredulity towards metanarratives.” ... To accept Lyotard's definition of <WSD>postmodernism</WSD> is to accept the premise that <WSD>postmodernism</WSD> is the first movement since the Enlightenment to think critically about such narratives. 
Meaning of the word marked with <WSD> tags:  An attitude of skepticism or irony toward modernist ideologies, often questioning the assumptions of Enlightenment rationality and rejecting the idea of objective truth.