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We found 25 dictionaries with English definitions that include the word ack:
Click on the first link on a line below to go directly to a page where "ack" is defined.

General (8 matching dictionaries)

1. ack: Merriam-Webster.com [home, info]
2. Ack, ack: Wordnik [home, info]
3. ACK, ack: Wiktionary [home, info]
4. ack: Infoplease Dictionary [home, info]
5. ACK, ack: Dictionary.com [home, info]
6. ACK (TCP), ACK (networking), ACK, Ack: Wikipedia, the Free Encyclopedia [home, info]
7. Ack: Rhymezone [home, info]
8. ack: Stammtisch Beau Fleuve Acronyms [home, info]

Business (2 matching dictionaries)

9. ACK: Travel Industry Dictionary [home, info]
10. ACK: BusinessDictionary.com [home, info]

Computing (10 matching dictionaries)

11. ACK: Free On-line Dictionary of Computing [home, info]
12. ACK: Netlingo [home, info]
13. ACK: CCI Computer [home, info]
14. ACK: BABEL: Computer Oriented Abbreviations and Acronyms [home, info]
15. ACK: CNET Internet Glossary [home, info]
16. ACK: Computer Telephony & Electronics Dictionary and Glossary [home, info]
17. ACK: Hacking Lexicon [home, info]
18. ACK: SMS Dictionary [home, info]
19. ACK: I T Glossary [home, info]
20. ACK (TCP), ACK (computing), ACK: Encyclopedia [home, info]

Medicine (1 matching dictionary)

21. ACK: online medical dictionary [home, info]

Miscellaneous (2 matching dictionaries)

22. ACK: Acronym Finder [home, info]
23. ACK: AbbreviationZ [home, info]

Tech (2 matching dictionaries)

24. ACK: Webster's New World Telecom Dictionary [home, info]
25. ACK: DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations [home, info]

Quick definitions from WordNet (Ack) ▸ name:  A surname (very rare: popularity rank in the U.S.: #53195) ▸ Words similar to ack ▸ Usage examples for ack ▸ Words that often appear near ack ▸ Rhymes of ack ▸ Invented words related to ack