middle class
US /ˌmɪd.əl ˈklæs/
UK /ˌmɪd.əl ˈklæs/

1.
the social group between the upper and working classes, including professional and business people and their families.
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The majority of the population belongs to the middle class.
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They aspire to a comfortable middle-class lifestyle.
1.
relating to or characteristic of the middle class.
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The neighborhood has a predominantly middle-class demographic.
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They live in a typical middle-class suburban home.