'first class' definitions:
Definition of 'first class'
(from WordNet)
adverb
By first class conveyance; with first class accommodations; "we always travel first class"
noun
The highest rank in a classification
noun
Mail that includes letters and postcards and packages sealed against inspection [syn: first class, 1st class, first- class mail, 1st-class mail]
noun
The most expensive accommodations on a ship or train or plane
Synonyms of 'first class'
From: Moby Thesaurus