first classes

first class

the best, finest, or highest class, grade, or rank.
the most expensive and most luxurious class of accommodation on trains, ships, airplanes, etc.
(in the U.S. Postal Service) the class of mail consisting of letters, postal cards, or the like, together with all mailable matter sealed against inspection.
British University. the group receiving the highest distinction in an honors course.

1740–50 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
first class
1.  the class or grade of the best or highest value, quality, etc
2.  of the best or highest class or grade: a first-class citizen
3.  excellent; first-rate
4.  of or denoting the most comfortable and expensive class of accommodation in a hotel, aircraft, train, etc
5.  a.  (in Britain) of or relating to mail that is processed most quickly
 b.  (in the US and Canada) of or relating to mail that consists mainly of written letters, cards, etc
6.  education See first
7.  by first-class mail, means of transportation, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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