Definitions for "First-class"
Of the best class; of the highest rank; in the first division; of the best quality; first-rate; as, a first-class telescope.
of the highest quality; "made an excellent speech"; "the school has excellent teachers"; "a first-class mind"
by first-class conveyance; with first-class accommodations; "we always travel first class"
The Bankruptcy Code's statutory ranking of unsecured claims that determines the order in which unsecured claims will be paid if there is not enough money to pay all unsecured claims in full.