First class Common

First class has 6 different meanings across 2 categories:

Definitions

Noun

the highest rank in a classification

first class

mail that includes letters and postcards and packages sealed against inspection

first class 1st class first-class mail 1st-class mail

the most expensive accommodations on a ship or train or plane

first class

premier rank.

Adjective

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

Adverb

by first class conveyance; with first class accommodations

"we always travel first class"

first class