(nineties)
Frequency: The word is one of the 700 most common words in English.
1.
Ninety is the number 90.
It was decided she had to stay another ~ days.
NUM
2.
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.
By this time she was in her nineties and needed help more and more frequently.
N-PLURAL
3.
The nineties is the decade between 1990 and 1999.
These trends only got worse as we moved into the nineties.
N-PLURAL: the N