We found 9 dictionaries that define the word first class mail:

General (7 matching dictionaries)

1. first-class mail: Vocabulary.com
2. first-class mail: Dictionary.com
3. First-class mail, First class mail: Wikipedia, the Free Encyclopedia
4. first-class mail: Rhymezone
5. first-class mail: FreeDictionary.org
6. first-class mail: Mnemonic Dictionary
7. first-class mail: TheFreeDictionary.com

Art (1 matching dictionary)

8. Glossary of Stamp Collecting Terms (No longer online)

Computing (1 matching dictionary)

9. first-class mail: Encyclopedia

▸ Words similar to first class mail ▸ Usage examples for first class mail ▸ Idioms related to first class mail ▸ Wikipedia articles (New!) ▸ Words that often appear near first class mail ▸ Rhymes of first class mail ▸ Invented words related to first class mail