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Definition of First class
1. Adverb. By first class conveyance; with first class accommodations. "We always travel first class"
2. Noun. The highest rank in a classification.
3. Noun. Mail that includes letters and postcards and packages sealed against inspection.
Exact synonyms: 1st Class, 1st-class Mail, First-class Mail
Generic synonyms: Mail
Specialized synonyms: Correspondence
Generic synonyms: Mail
Specialized synonyms: Correspondence
4. Noun. The most expensive accommodations on a ship or train or plane.
Generic synonyms: Accommodation
Definition of First class
1. Adjective. Belonging to the best or top group in a system of classification. ¹
2. Adjective. Of, or relating to the most luxurious and expensive class of accommodation on a train, ship, hotel, etc. ¹
3. Adjective. Of, or relating to a class of mail to be delivered before second class. ¹
4. Adjective. (cricket) Of, or relating to a first class match. ¹
5. Proper noun. A rank in the Boy Scouts of America, above tenderfoot and second class, that traditionally has required proficiency in scoutcraft skills. ¹
¹ Source: wiktionary.com