ˌworking ˈclass noun [singular also + plural verb] British English (also working classes)
the group of people in society who traditionally do physical work and do not have much money or power:
Marx wrote about the political struggles of the working class.
—working class adjective:
working class women
the traditional working class occupations
He is proud of his working class background.
⇒ lower class, middle class, upper class

[TahlilGaran] Dictionary of Contemporary English ▲

class a group of students or schoolchildren who are taught together:
There are twenty kids in the class.
She gets along well with the other children in her class.
I’m going out with some friends from my dance class.
'I graduated in 1999.' 'What class were you in?'
background the type of home and family you come from, and its social class:
The school takes kids from all sorts of backgrounds.
We come from the same town and share a similar background.
⇒ working-class/middle-class etc background:
The organization helps children from working-class backgrounds to go to university.
middle-class belonging to the class of people who are usually well educated, fairly rich, and who work in jobs which they have trained to do. For example, doctors, lawyers, and managers are middle-class:
The newspaper’s readers are mostly middle class.
They live in a middle-class neighbourhood on the edge of town.
white-collar someone who works in an office, not a factory, mine etc: white-collar worker/job/employee:
The economic recession has put many white-collar workers in danger of losing their jobs.
working-class belonging to the class of people who do not have much money or power, and who have jobs where they do physical work. For example, factory workers, builders, and drivers are working-class:
Most of the people who live round here are working class.
I come from a working-class family – I’m the first one to graduate from college.
blue-collar someone who does physical work, for example in a factory or a mine, and does not work in an office: blue-collar worker/job/employee:
His political support comes mainly from blue-collar workers.
upper-class belonging to the class of people who originally had most of the money and power, especially families that own a lot of land:
Most senior politicians in the UK are from upper-class families.
He spoke with an upper-class accent.
underclass the lowest social class, who are very poor and may not have jobs, homes etc:
The government has created an underclass who do not feel they have any rights in society.

[TahlilGaran] English Thesaurus ▲