中产阶级并非是一个可以精确衡量和界定的名词，下面是英语中的一般定义： (来源：英语杂志 http://www.EnglishCN.com)

middle class

Social class usually comprising of white-collar (non-manual) workers, lower-level managers, and small business owners, often constituting about one-third of the employed population of a country. The income of this class is higher than that of the working-class but lower than that of the upper-middle class (doctors, engineers, lawyers, middle-size business owners) and upper class.

中产阶级

通常包含了白领阶层(非体力劳动)工人,低层管理者和小企业主,往往约占一个国家就业人口的三分之一。这个阶层的收入高于劳动阶级但低于中上阶层(医生、工程师、律师、中型企业主)和上层阶级。