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(gè)國(guó)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(gè)世紀(jì)中從90到99年的十年時(shí)間
A decade or the numbers from 90 to 99:
介于90到99之間的時(shí)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）