We found 32 dictionaries that define the word ad infinitum:

General (23 matching dictionaries)

1. ad infinitum: Merriam-Webster
2. ad infinitum: Oxford Learner's Dictionaries
3. ad infinitum: American Heritage Dictionary of the English Language
4. ad infinitum: Collins English Dictionary
5. ad infinitum: Vocabulary.com
6. ad infinitum: Wordnik
7. ad infinitum: Cambridge Advanced Learner's Dictionary
8. ad infinitum: Wiktionary
9. ad infinitum: The Wordsmyth English Dictionary-Thesaurus
10. ad infinitum: Infoplease Dictionary
11. Ad infinitum, ad infinitum: Dictionary.com
12. Ad Infinitum (band), Ad Infinitum, Ad infinitum: Wikipedia, the Free Encyclopedia
13. Ad infinitum: Online Plain Text English Dictionary
14. ad infinitum: Rhymezone
15. ad infinitum: AllWords.com Multi-Lingual Dictionary
16. ad infinitum: FreeDictionary.org
17. ad infinitum: Mnemonic Dictionary
18. ad infinitum: Foreign Words and Phrases
19. ad infinitum: TheFreeDictionary.com
20. ad infinitum: Longman Dictionary of Contemporary English
21. ad infinitum: Merriam-Webster

Business (4 matching dictionaries)

22. MoneyGlossary.com (No longer online)
23. Duhaime's Canadian law dictionary (No longer online)
24. Ad Infinitum: Investopedia
25. Ad-infinitum, ad infinitum: Legal dictionary

Miscellaneous (2 matching dictionaries)

26. ad infinitum: Idioms
27. ad infinitum: Wordcraft Dictionary

Religion (1 matching dictionary)

28. Irivng Hexham's Concise Dictionary of Religion (No longer online)

Science (1 matching dictionary)

29. ad infinitum: PlanetMath Encyclopedia

Slang (1 matching dictionary)

30. Ad infinitum: Urban Dictionary

Definitions from Wiktionary (ad infinitum) ▸ adverb:  Endlessly; for ever; neverendingly. Similar: in infinitum, for ever and ever, for ever, no end, perpetually, forever, ever, exhaustlessly, ever and ever, countlessly, more... Opposite: finite, limited, bounded Adjectives: eternal, ageless, sempiternal, perpetual, minutely, everlasting, occasional, everchanging, everliving, evergreen, ever-changing ▸ Words similar to ad infinitum ▸ Usage examples for ad infinitum ▸ Idioms related to ad infinitum ▸ Wikipedia articles (New!) ▸ Words that often appear near ad infinitum ▸ Rhymes of ad infinitum ▸ Invented words related to ad infinitum