This is the 9789th most frequent German word.
neunzigern
"Neunzigern" refers to "the 1990s" in German.
Post-Indefinitive plural noun referring to the time period of the 90s decade.
In den Neunzigern war die Technologie noch weniger weit entwickelt.
In the nineties, technology was still less advanced.
Plural noun prefixed with 'aus', indicating something originating or pertaining to the 90s decade.
Musik aus den Neunzigern hat einen besonderen Charme.
Music from the nineties has a special charm.
Post-possessive plural noun form indicates ownership or relation to the 90s time period.