Usually means: Postal service for letters, parcels.
Definitions Related words Mentions
We found 6 dictionaries that define the word 1st-class mail:

General (5 matching dictionaries)
  1. 1st-class mail: Vocabulary.com
  2. 1st-class mail: Dictionary.com
  3. 1st-class mail: Rhymezone
  4. 1st-class mail: FreeDictionary.org
  5. 1st-class mail: Mnemonic Dictionary

Computing (1 matching dictionary)
  1. 1st-class mail: Encyclopedia

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Definitions from WordNet (1st-class mail)

▸ noun:  mail that includes letters and postcards and packages sealed against inspection


Opposite:
bulk mail, standard mail, third-class mail

Types:
postcards, letters, large envelopes, packages, more...

▸ Words similar to 1st-class mail

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Similar:

Opposite:
bulk mail, standard mail, third-class mail

Types:
postcards, letters, large envelopes, packages, more...




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