Postmodernism was named but not theoretically unified by 1981

Evidence

The net effect was a discursive dispersion: on the one hand, philosophical overview without significant aesthetic content, on the other aesthetic insight without coherent theoretical horizon. A thematic crystallization had occurred — the postmodern was now, as Habermas put it, ‘on the agenda’ — without intellectual integration. — Perry Anderson, The Origins of Postmodernity, 99

Categorization

• XREF: connects to: 1989 completed the sixties-era shift to postmodernity — Marianne DeKoven, Utopia Limited: The Sixties and the…, 963