1 the class or grade of the best or highest value, quality, etc.
adj first-class when prenominal
2 of the best or highest class or grade
a first-class citizen
4 of or denoting the most comfortable and expensive class of accommodation in a hotel, aircraft, train, etc.
a (in Britain) of or relating to mail that is processed most quickly
b (in the U.S. and Canada) of or relating to mail that consists mainly of written letters, cards, etc.
6 (Education) See →
7 by first-class mail, means of transportation, etc.
English Collins Dictionary - English Definition & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"