ninety · number
(be) in your nineties/90s
B2 to be aged between 90 and 99
Dictionary examples:
He is in his nineties now. (18.3)
the nineties/'90s
B2 the years 1990 through 1999
Dictionary examples:
I spent most of the nineties traveling around the world. (30.4)
ninety
A2 the number 90
Dictionary examples:
I told ninety jokes, but only one person laughed! (0.0)
My grandpa is ninety years old but still loves skateboarding! (0.0)
The teacher gave me ninety stickers for being quiet for five minutes! (0.0)
eighty, ninety, a hundred (4.2)
Ninety percent of the people surveyed were in favor. (46.8)