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First class Common

First class has 6 different meanings across 2 categories:

Noun · Adverb

Definitions
Noun
1

the highest rank in a classification

2

mail that includes letters and postcards and packages sealed against inspection

3

the most expensive accommodations on a ship or train or plane

4

premier rank.

Adjective
1

Belonging to the best or top group in a system of classification.