We found 6 dictionaries that define the word j 4:

General (3 matching dictionaries)

1. J-4: Wordnik
2. J-4: Dictionary.com
3. J-4: Wikipedia, the Free Encyclopedia

Miscellaneous (1 matching dictionary)

4. J-4: Acronym Finder

Tech (2 matching dictionaries)

5. J-4: Webster's New World Telecom Dictionary
6. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

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