We found 16 dictionaries that define the word isn:

General (10 matching dictionaries)

1. ISN: Vocabulary.com
2. Isn, Isn, isn, isn: Wordnik
3. ISN: Dictionary.com
4. isn: Cambridge Essential American English Dictionary
5. ISN: Wikipedia, the Free Encyclopedia
6. Isn: Rhymezone
7. ISN: Stammtisch Beau Fleuve Acronyms
8. isn: FreeDictionary.org
9. isn: Mnemonic Dictionary
10. ISN: TheFreeDictionary.com

Computing (1 matching dictionary)

11. ISN: Netlingo

Miscellaneous (3 matching dictionaries)

12. ISN: Acronym Finder
13. AbbreviationZ (No longer online)
14. isn: Idioms

Slang (1 matching dictionary)

15. isn: Urban Dictionary

Tech (1 matching dictionary)

16. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

(Note: See isns as well.)

Definitions from WordNet (Isn) ▸ noun:  Switzerland's information network for security and defense studies and for peace and conflict research and for international relations Opposite: isn't, is not, negation of is Types: Jainism, Hinduism, Buddhism, Taoism, Confucianism, Shinto, more... Phrases: a person who knows and isn, more... ▸ Words similar to isn ▸ Usage examples for isn ▸ Idioms related to isn ▸ Wikipedia articles (New!) ▸ Popular adjectives describing isn ▸ Words that often appear near isn ▸ Rhymes of isn ▸ Invented words related to isn