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first-class

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The definition of first-class is of the highest or best.

(adjective)

An example of something first-class are the most comfortable and luxurious seats on a plane; first-class seats.

First-class is defined as done in the most lavish or stylish way.

(adverb)

An example of first-class used as an adverb is in the phrase "to travel first-class," which means to sit in the front part of a plane and receive deluxe service.

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

adjective

of the highest class, rank, excellence, etc.; of the best quality
designating or of the most expensive accommodations: a first-class cabin on a ship
☆ designating or of a class of ordinary mail given privileged postal treatment (as forwarding, if necessary) at postage rates higher than those for other classes of ordinary mail: the class includes letters or other material sealed against inspection and also includes, at a postage rate lower than that for sealed material, postal cards and postcards

adverb

with the most expensive accommodations: to travel first-class
as or by first-class mail

See first-class in American Heritage Dictionary 4

noun

The first, highest, or best group in a system of classification: a restaurant of the first class.
The most luxurious and most expensive class of accommodations on a train, passenger ship, airplane, or other conveyance.
A class of mail including letters, post cards, and sealed packages.

adjective

Constituting or belonging to the first, highest, or best group in a system of classification: a first-class hotel; first-class mail.
Of the foremost excellence or highest quality; first-rate: a first-class mind.

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