postmillennial
adjective
post·mil·len·ni·al ˌpōs(t)-mə-ˈle-nē-əl 
1
: coming after or relating to the period after the millennium
2
: holding or relating to postmillennialism
Example Sentences
Recent Examples on the Web Lil Nas X, Kane Brown and Blanco Brown — all of them are doing something that’s very much a kind of millennial or postmillennial moment. 
Los Angeles Times, 4 Sep. 2019 Interwoven with all this is a postmillennial love story. N. K. Jemisin, New York Times, 28 Dec. 2015 The Go Team’s ongoing dissection of postmillennial sonic overload skews sweet and surreal on Rolling Blackouts, the U.K. pop-hop collective’s addictive third — and possibly final — record. Scott Thill, WIRED, 31 Jan. 2011
Los Angeles Times, 4 Sep. 2019 Interwoven with all this is a postmillennial love story. N. K. Jemisin, New York Times, 28 Dec. 2015 The Go Team’s ongoing dissection of postmillennial sonic overload skews sweet and surreal on Rolling Blackouts, the U.K. pop-hop collective’s addictive third — and possibly final — record. Scott Thill, WIRED, 31 Jan. 2011 Word History
First Known Use
1851, in the meaning defined at sense 1