名詞 ninety:

1. the cardinal number that is the product of ten and nine
   同義詞：90, XC

形容詞 ninety:

1. being ten more than eighty
   同義詞：90, xc

1. Over ninety countries ratify an agreement to ban the use of these chemicals.
   九十多個國家批準(zhǔn)了一項(xiàng)禁止使用這些化學(xué)品的協(xié)議。
2. Mr Hobbs has had several severe illnesses in the last few years, each of which could easily have finished him off. But he's like a cat with nine lives and will probably live to see ninety.
   在最近幾年中，霍布斯先生得了幾次重病，每次都可能容易地奪去他的生命。但是，他卻像有九條命的貓，很有可能活到90歲。
3. He must be going on for ninety.
   他準(zhǔn)有九十歲了。
4. He was born in the nineties of the nineteen century.
   他生于十九世紀(jì)九十年代。

nine.ty

n.（名詞）
【復(fù)數(shù)】 nine.ties
The cardinal number equal to 9 × 0.
九十：與9乘以0相等的基數(shù)
nineties
nineties
Often Nineties The decade from 90 to 99 in a century.
常作 Nineties 九十年代：在一個世紀(jì)中從90到99年的十年時間
A decade or the numbers from 90 to 99:
介于90到99之間的時間或數(shù)字：
例句：
My grandparents are in their nineties. During the heat wave, the temperature stayed in the nineties.
我的祖父母已經(jīng)九十多歲了。熱浪來襲期間，溫度保持在九十度

來源：
Middle English ninti
中古英語 ninti
from Old English nigontig * see newô
源自 古英語 nigontig *參見 newô

【引伸】
nine.ty
adj.（形容詞）
pron.（代詞）