Definition of "class" []

• A set, collection, group, or configuration containing members regarded as having certain attributes or traits in common; a kind or category. (noun)
• A division based on quality, rank, or grade, as: (noun)
• A grade of mail: a package sent third class. (noun)
• A quality of accommodation on public transport: tourist class. (noun)
• A social stratum whose members share certain economic, social, or cultural characteristics: the lower-income classes. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Ministers, as a class, know less practically of human nature than any other _class_ of men."
• "(Possibly events of the past year or two mark the beginning of the waning of the powers of monopolists, and of the partial transfer of those powers to a capitalistic middle class; but exploitation of _the working class_ continues under such new masters no less vigorously than before.)"
• "Java里也有两个让初学者容易混淆的概念：nest class and inner class。 nest class就是static inner class,"