What does "middle class" mean?

A social and economic class lying above the working class and below the upper class.

Middle class

Common synonyms include: bourgeoisie, average-income, bourgeois, bourgeoisie, burgher, burgherdom.

noun

noun ·Uncommon ·College level

Noun

1
A social and economic class lying above the working class and below the upper class.
"All this has led to an explosion of protest across China, including among a middle class that has discovered nimbyism."
2
the social class between the lower and upper classes wordnet
3
The groups in society composed of professionals, semi-professionals, and lower to middle managerial level workers. in-plural

"All this has led to an explosion of protest across China, including among a middle class that has discovered nimbyism."