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)

6. 1st-class mail: Encyclopedia

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