We found 18 dictionaries that define the word as a matter of fact:

General (14 matching dictionaries)

1. as a matter of fact: Merriam-Webster
2. as a matter of fact: Oxford Learner's Dictionaries
3. as a matter of fact: Collins English Dictionary
4. as a matter of fact: Vocabulary.com
5. as a matter of fact: Cambridge Advanced Learner's Dictionary
6. as a matter of fact: Wiktionary
7. as a matter of fact: Dictionary.com
8. as a matter of fact: Rhymezone
9. as a matter of fact: FreeDictionary.org
10. as a matter of fact: Mnemonic Dictionary
11. as a matter of fact: TheFreeDictionary.com
12. as a matter of fact: Longman Dictionary of Contemporary English

Business (2 matching dictionaries)

13. as a matter of fact: Merriam-Webster Legal Dictionary
14. as a matter of fact: Legal dictionary

Medicine (1 matching dictionary)

15. as a matter of fact: Merriam-Webster Medical Dictionary

Miscellaneous (1 matching dictionary)

16. as a matter of fact: Idioms

Definitions from WordNet (as a matter of fact) ▸ adverb:  in reality or actuality ("As a matter of fact, he is several inches taller than his father") Opposite: fiction, falsehood, fabrication, untruth, lie Types: actually, in reality, in truth, in fact, really, honestly, more... ▸ Words similar to as a matter of fact ▸ Usage examples for as a matter of fact ▸ Idioms related to as a matter of fact ▸ Wikipedia articles (New!) ▸ Words that often appear near as a matter of fact ▸ Rhymes of as a matter of fact ▸ Invented words related to as a matter of fact