We found 16 dictionaries that define the word exch:

General (11 matching dictionaries)

1. exch: Merriam-Webster
2. exch: Oxford Learner's Dictionaries
3. exch: American Heritage Dictionary of the English Language
4. Exch: Wordnik
5. EXCH, exch: Dictionary.com
6. exch: TheFreeDictionary.com
7. exch: Infoplease Dictionary
8. exch: Wordnik
9. Exch: Wiktionary
10. exch: Webster's New World College Dictionary, 4th Ed.
11. exch: Longman Dictionary of Contemporary English

Computing (2 matching dictionaries)

12. EXCH: Free On-line Dictionary of Computing
13. EXCH: Encyclopedia

Medicine (1 matching dictionary)

14. online medical dictionary (No longer online)

Miscellaneous (2 matching dictionaries)

15. EXCH: Acronym Finder
16. AbbreviationZ (No longer online)

Definitions from Wiktionary (Exch) ▸ noun:  Abbreviation of exchange. [An act of exchanging or trading.] ▸ Words similar to exch ▸ Usage examples for exch ▸ Idioms related to exch ▸ Wikipedia articles (New!) ▸ Popular adjectives describing exch ▸ Words that often appear near exch ▸ Rhymes of exch ▸ Invented words related to exch