One generation builds a clean, confident set of rules and calls it modern. The next generation stands behind that and talks back to it: borrowing the old shapes on purpose, mixing them, quoting them, joking with them, and doubting that any single style or single truth is the right one. The word marks that position — after the rules, and pointed at them.
From post- plus modern: post- is the Latin-derived prefix meaning after. The word is a position in time first, and an attitude second.
由 post-（來自拉丁文 post，意思是「在……之後」）加上 modern 組成。這個字先是一個時間位置，之後才長出態度的意思——先是「在那之後」，才變成「對那套規矩有意見」。
Wiktionary (kaikki extract, source_ref kaikki:3f6f69a190036ae4:923555526:12486): 'From post- + modern.' with the chain Latin post > English post-.
From the picture
當代生活的樣子
同樣是「在那之後」的位置，但這次形容的不是作品，而是生活本身。螢幕、廣告、品牌、無止境的選擇，把日常過成一種到處都是引用和形象的狀態——等於那個風格從美術館走進了街上。
adjective · C1
Used about the styles and attitudes of life in many western countries today, in which television, screens, images, and the buying of goods and services hold a very large place.
（當代西方社會）後現代的
adjective · C1
Belonging to postmodernism, or shaped by it: a way of making art, buildings, books, films and ideas that came after modernism and answers back to it, borrowing old styles on purpose, mixing them, and refusing to treat any one style as the correct one.
後現代（主義）的