Definition

1. Noun:

   • The highest quality or rank in a classification system: Refers to the top category, often implying superior quality, status, or service.
   • The most expensive and luxurious accommodations on a ship, train, or airplane: Denotes premium travel seating with enhanced comfort and amenities.
   • A category of mail in some postal systems: Refers to mail, typically letters and postcards, given priority handling and faster delivery.

2. Adverb:

   • Using the highest quality or most expensive service, especially for travel: Describes the manner of traveling or sending mail using the premium, first-class option.

Usage Examples

• Noun:

  • She always flies first class when she travels for business. (She always uses the most luxurious and expensive seats on the airplane.)
  • The university is considered first class in its research facilities. (The university is ranked in the highest category for its research facilities.)
  • Please send this document by first class to ensure it arrives tomorrow. (Please send this document using the priority mail service.)

• Adverb:

  • We decided to travel first class for our anniversary trip. (We decided to use the premium travel accommodations for our trip.)
  • The package was shipped first class. (The package was sent using the fastest and most prioritized mail service.)

Advanced Usage

• "First-class" (as a hyphenated adjective): Of the highest quality; excellent.
  • He did a first-class job on the renovation. (He did an excellent, top-quality job on the renovation.)
  • The hotel offers first-class service to all its guests. (The hotel provides superior, excellent service.)

Variants and Related Words

• First-rate (adjective): Excellent, of the highest quality. (Synonymous with the adjectival use of "first-class").
  • The food at the restaurant was first-rate.
• Premier (adjective): First in importance, order, or position.
  • It is the country's premier research institution.

Synonyms

• Noun (for quality/rank): Top tier, premier, grade A, superior.
• Noun (for travel): Premium class, business class (context-specific, often a separate high-quality tier).
• Adverb: In style, luxuriously.

Related Phrases

• First-class citizen (idiom, computing/sociology): An entity treated with the same importance and rights as others in a system.
  • In this programming language, functions are first-class citizens. (Functions have the same status and capabilities as other data types.)
• First-class honours (academic): The highest degree classification in some university systems.
  • She graduated with first-class honours in Physics.

Adverb

1. by first class conveyance; with first class accommodations
   • we always travel first class

Noun

1. the most expensive accommodations on a ship or train or plane
2. mail that includes letters and postcards and packages sealed against inspection
3. the highest rank in a classification