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third-class

The definition of third class is something or someone that is considered lower in class or rank than second class.

(adjective)

An example of a third class train ticket is one where you get only a tiny little seat and no access to a restaurant or snacks, unlike people in first class with whole railroad cars to themselves or people in second class with a little cubby to themselves.

See third-class in Webster's New World College Dictionary

adjective

of the class, rank, excellence, etc. next below the second
designating or of accommodations next below the second class
☆ designating or of a lower-cost class of mail limited to merchandise weighing less than 16 oz or bulk mailing of identical circulars, bulletins, advertisements, etc.

adverb

with accommodations next below the second class: to travel third-class
☆ as or by third-class mail

See third-class in American Heritage Dictionary 4

noun

A class of mail in the U.S. postal system including all printed matter, except newspapers and magazines, that weighs less than 16 ounces and is unsealed.
Accommodations, as on a ship or train, that are of the third and usually lowest order of luxury and price.

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