We found 26 dictionaries that define the word jam session:

General (18 matching dictionaries)

1. jam session: Merriam-Webster
2. jam session: Oxford Learner's Dictionaries
3. jam session: American Heritage Dictionary of the English Language
4. jam session: Collins English Dictionary
5. jam session: Vocabulary.com
6. jam session: Cambridge Advanced Learner's Dictionary
7. jam session: Wiktionary
8. jam session: The Wordsmyth English Dictionary-Thesaurus
9. jam session: Infoplease Dictionary
10. jam session: Dictionary.com
11. Jam Session (album), Jam Session (software), Jam session (disambiguation), Jam session: Wikipedia, the Free Encyclopedia
12. jam session: Rhymezone
13. jam session: FreeDictionary.org
14. jam session: Mnemonic Dictionary
15. jam session: TheFreeDictionary.com
16. jam session: Longman Dictionary of Contemporary English

Art (1 matching dictionary)

17. Jazz Humor (No longer online)

Business (1 matching dictionary)

18. jam session: Legal dictionary

Computing (1 matching dictionary)

19. jam session: Encyclopedia

Medicine (1 matching dictionary)

20. jam session: Medical dictionary

Miscellaneous (2 matching dictionaries)

21. AbbreviationZ (No longer online)
22. jam session: Idioms

Slang (2 matching dictionaries)

23. jam session: Green’s Dictionary of Slang
24. jam session: Urban Dictionary

(Note: See jam_sessions as well.)

Definitions from Wiktionary (jam session) ▸ noun:  (music) An informal gathering of musicians to play music, especially improvised jazz or a similar genre. Similar: descarga, jazz, jasm, jazz band, jazzfest, nu jazz, jass, jasz, modal jazz, juke joint, more... ▸ Words similar to jam session ▸ Usage examples for jam session ▸ Idioms related to jam session ▸ Wikipedia articles (New!) ▸ Words that often appear near jam session ▸ Rhymes of jam session ▸ Invented words related to jam session