forty /ˈfɔ:ti/ num. 四十；四十几，四十年代：There are forty students in our class.我们班有四十个学生。Forty were arrested.四十人被捕。Terry was in his early forties.特里四十岁刚出头。Though he is forty, he is still unmarried.尽管他已经40岁了，但还是独身。