noun
[ C +sing./pl. v . ] the social class whose members are neither very rich nor very poor and that includes professional and business people :
the upper / lower middle class
the growth of the middle classes
—compare upper class , working class
noun
[ C +sing./pl. v . ] the social class whose members are neither very rich nor very poor and that includes professional and business people :
the upper / lower middle class
the growth of the middle classes
—compare upper class , working class
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005