1. Very good;of the highest quality
   "a first-class mind"
   - excellent, fantabulous, splendid, beaut [Austral, NZ], top-drawer

1. The highest rank in a classification 
2. Mail that includes letters and postcards and packages sealed against inspection
   - 1st class, first-class mail, 1st-class mail 
3. The most expensive accommodations on a ship or train or plane

1. By first class conveyance; with first class accommodations
   "we always travel first class"

Derived forms: first classes

See also: superior

Type of: accommodation, high quality, mail, superiority

Encyclopedia: First class

• atoll
• atom
• atom smasher
• atom-bomb
• atomic
• atomic bomb
• atomic clock
• atomic cocktail
• atomic energy
• Atomic Energy Commission
• atomic explosion
• atomic mass
• atomic mass unit
• atomic number
• atomic number 1
• atomic number 10
• atomic number 100
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• atomic number 108