We found 11 dictionaries that define the word thirty first:

General (10 matching dictionaries)

1. thirty-first: Merriam-Webster
2. thirty-first: Vocabulary.com
3. Thirty-first, thirty-first: Wordnik
4. thirty-first: Wiktionary
5. thirty-first: Infoplease Dictionary
6. thirty-first, thirty first: Dictionary.com
7. thirty-first: Rhymezone
8. thirty-first: FreeDictionary.org
9. thirty-first: Mnemonic Dictionary
10. thirty-first: TheFreeDictionary.com

Art (1 matching dictionary)

11. Thirty-First: Encyclopedia of Organ Stops

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