ninety

1. NUM Ninety is the number 90. 90

It was decided she had to stay another ninety days. 经决定，她必须再呆九十天。

2. N-PLURAL When you talk about the nineties, you are referring to numbers between 90 and 99. For example, if you are in your nineties, you are aged between 90 and 99. If the temperature is in the nineties, the temperature is between 90 and 99 degrees. 九十几 (指从90到99之间)

By this time she was in her nineties and needed help more and more frequently. 到这时她已经九十多岁了，越来越频繁地需要帮助。

3. N-PLURAL The nineties is the decade between 1990 and 1999. (二十世纪) 九十年代

These trends only got worse as we moved into the nineties. 当我们进入了90年代，这些风气只不过变得更糟了。