We found 21 dictionaries that define the word postal service:

General (15 matching dictionaries)

1. postal service: Longman Dictionary of Contemporary English
2. postal service, the Postal Service, the postal service: Merriam-Webster
3. postal service: Oxford Learner's Dictionaries
4. postal service: American Heritage Dictionary of the English Language
5. postal service: Vocabulary.com
6. postal-service: Wordnik
7. postal service: The Wordsmyth English Dictionary-Thesaurus
8. postal service: Dictionary.com
9. Postal Service, Postal service (disambiguation), Postal service, The Postal Service: Wikipedia, the Free Encyclopedia
10. postal service: Rhymezone
11. postal service: FreeDictionary.org
12. postal service: Mnemonic Dictionary
13. postal service: TheFreeDictionary.com

Art (1 matching dictionary)

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

Business (1 matching dictionary)

15. postal service: Legal dictionary

Computing (1 matching dictionary)

16. postal service: Encyclopedia

Medicine (2 matching dictionaries)

17. Medical Dictionary (No longer online)
18. online medical dictionary (No longer online)

Slang (1 matching dictionary)

19. postal service: Urban Dictionary

(Note: See postal_services as well.)

Definitions from WordNet (postal service) ▸ noun:  the system whereby messages are transmitted via the post office Opposite: non-postal service, private courier, delivery service Types: FedEx, UPS, USPS, DHL, Royal Mail, more... Phrases: United States Postal Service, us postal service, United States Postal Inspection Service, us postal inspection service, The Postal Service, more... ▸ Words similar to postal service ▸ Usage examples for postal service ▸ Idioms related to postal service ▸ Wikipedia articles (New!) ▸ Words that often appear near postal service ▸ Rhymes of postal service ▸ Invented words related to postal service