Still working to recover. Please don't edit quite yet.
The working class consists of all the people in society who can not get by without selling our time and energy to a boss - by working. I.e. if we do not make large amounts of money from property holdings or owning a business we have to be wage labourers, or in some places in the world rely on state welfare or crime.
This definition is from the libcom.org Glossary section.