the nineties[plural] (also the '90s, the 1990s) the years from 1990 to 1999 (二十世纪)九十年代 America was far richer in the nineties. 90年代的美国要富裕得多。
the early/mid/late nineties The industry received a lot of bad publicity in the early nineties. 该行业在90年代早期受到了大量负面宣传。
→ the nineties at ninety(1)