first class

1. The first, highest, or best group in a system of classification: a restaurant of the first class.
2. The most luxurious and most expensive class of accommodations on a train, passenger ship, airplane, or other conveyance.
3. A class of mail including letters, post cards, and sealed packages.

The noun has 3 meanings:

Meaning #1: the highest rank in a classification

Meaning #2: mail that includes letters and postcards and packages sealed against inspection
  Synonyms: 1st class, first-class mail, 1st-class mail, priority mail

Meaning #3: the most expensive accommodations on a ship or train or plane

The term First class (or 1st class, Firstclass) generally implies a high level of service, importance or quality. Specific uses of the term include:

• First class travel
  • First class (aviation)
• First Class mail
• First-class cricket
• First Class rank in Boy Scouting (Boy Scouts of America)
• First Class Diver – the highest grade of diver in the original (and now obsolete) classification system of the British Sub Aqua Club.
• First class honours degree – see British undergraduate degree classification
• First class city in the Philippines – see Cities of the Philippines#Income classification

In mathematics:

• First class constraint

In computing:

• First class (computing), a concept in data modeling
• First-class object, a concept in programming
• First-class function
• FirstClass, e-mail and online conferencing system

In television:

• First Class (TV Series)

As the name of something:

• The First Class, a band
• 1st Class (album) is the 2002 album by Large Professor
• First Class (game show) – a UK television game show

In comics

• A comic strip in The Dandy

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