of very good quality, and much better than other things of the same type:
This is a first-class wine.
His writing is first-class.
relating to the class of post that is the most expensive and quickest to arrive
relating to the best and most expensive class of seats on a plane or train, or rooms in a hotel
—first class adverb:WORD FOCUS: good
If I send the letter first class it should arrive tomorrow.
travel first class
very good: excellent, fantastic, wonderful, great, terrific, neat American English, superb, amazing, outstanding, brilliant, impressive, fine, first-class, out of this world
of good quality: high quality, top quality, superior, deluxe, classy
morally good: decent, virtuous, respectable, honourable British English/honorable American English, upright, beyond reproach
➔ See also good