We found 17 dictionaries that define the word tack on:

General (11 matching dictionaries)

1. tack on: Longman Dictionary of Contemporary English
2. tack on: Vocabulary.com
3. tack-on: Wordnik
4. tack on: Dictionary.com
5. tack on: Rhymezone
6. tack on: AllWords.com Multi-Lingual Dictionary
7. tack on: FreeDictionary.org
8. tack on: Mnemonic Dictionary
9. tack on: TheFreeDictionary.com

Business (2 matching dictionaries)

10. tack on: Legal dictionary
11. tack on: Financial dictionary

Computing (1 matching dictionary)

12. tack on: Encyclopedia

Medicine (1 matching dictionary)

13. tack on: Medical dictionary

Miscellaneous (1 matching dictionary)

14. tack on: Idioms

Slang (1 matching dictionary)

15. tack-on: Urban Dictionary

Definitions from WordNet (tack on) ▸ verb:  fix to; attach Opposite: subtract, remove, detach, take away Phrases: to tack on, more... ▸ Words similar to tack on ▸ Usage examples for tack on ▸ Idioms related to tack on ▸ Wikipedia articles (New!) ▸ Words that often appear near tack on ▸ Rhymes of tack on ▸ Invented words related to tack on