或许您说的是dis·cip·line这个单词？

在牛津词典中有名词和动词两种词性

名词作为：

1、 a method of training your mind or body or of controlling your behaviour; an area of activity where this is necessary  训练方法、行为准则、符合准则的行为

2、an area of knowledge; a subject that people study or are taught, especially in a university 知识领域；（尤指大学的）学科，科目

这两个释义时是可数的

作为：

1、the practice of training people to obey rules and orders and punishing them if they do not; the controlled behaviour or situation that results from this training 训练；训导；纪律；风纪

2、 the ability to control your behaviour or the way you live, work, etc. 自制力；遵守纪律

时是不可数的