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We found 34 dictionaries with English definitions that include the word add on:
Click on the first link on a line below to go directly to a page where "add on" is defined.

General (23 matching dictionaries)

1. add-on: Merriam-Webster.com [home, info]
2. add-on: Oxford Dictionaries [home, info]
3. add-on: American Heritage Dictionary of the English Language [home, info]
4. add-on, add-on: Collins English Dictionary [home, info]
5. add-on, add on: Vocabulary.com [home, info]
6. add-on, add on: Macmillan Dictionary [home, info]
7. Add-On, Add-on, add-on: Wordnik [home, info]
8. add-on: Cambridge Advanced Learner's Dictionary [home, info]
9. add-on, add on: Wiktionary [home, info]
10. add-on: Webster's New World College Dictionary, 4th Ed. [home, info]
11. add-on: The Wordsmyth English Dictionary-Thesaurus [home, info]
12. add-on: Infoplease Dictionary [home, info]
13. add-on, add on: Dictionary.com [home, info]
14. add on: UltraLingua English Dictionary [home, info]
15. Add-on, Add-on (Mozilla), Add-on (disambiguation): Wikipedia, the Free Encyclopedia [home, info]
16. add-on, add on: Rhymezone [home, info]
17. add-on, add on: Free Dictionary [home, info]
18. add-on, add on: Mnemonic Dictionary [home, info]
19. add on: WordNet 1.7 Vocabulary Helper [home, info]
20. add-on, add on: LookWAYup Translating Dictionary/Thesaurus [home, info]
21. add-on, add on: Dictionary/thesaurus [home, info]

Business (3 matching dictionaries)

22. add-on: Glossary of Legal Terms [home, info]
23. Add-On, add on: Legal dictionary [home, info]
24. Add-On: Financial dictionary [home, info]

Computing (3 matching dictionaries)

25. Add-on: CCI Computer [home, info]
26. Add-on: Tech Terms Computer Dictionary [home, info]
27. add-on, add on: Encyclopedia [home, info]

Slang (1 matching dictionary)

28. add-on: Urban Dictionary [home, info]

Sports (2 matching dictionaries)

29. Add-on: Dan's Poker [home, info]
30. Add-on: Texas Hold'em Dictionary [home, info]

Tech (2 matching dictionaries)

31. Add-on: AUTOMOTIVE TERMS [home, info]
32. ADD-ON: Glossary of Common Hearth and Heating Terms [home, info]

(Note: See add_ons for more definitions.)

Quick definitions from WordNet (add on) ▸ verb:  make an addition ("Let's add on to this") ▸ verb:  add to the very end ▸ Also see add_ons ▸ Words similar to add on ▸ Usage examples for add on ▸ Words that often appear near add on ▸ Rhymes of add on ▸ Invented words related to add on