We found 9 dictionaries that define the word gregorian chants:

General (7 matching dictionaries)

1. Gregorian chants, gregorian chants: Merriam-Webster
2. Gregorian chants: Collins English Dictionary
3. Gregorian chants: Vocabulary.com
4. Gregorian chants: Cambridge Advanced Learner's Dictionary
5. Gregorian chants: Wiktionary
6. Gregorian chants: Wikipedia, the Free Encyclopedia
7. Gregorian Chants: TheFreeDictionary.com

Computing (1 matching dictionary)

8. Gregorian Chants: Encyclopedia

Religion (1 matching dictionary)

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

(Note: See gregorian_chant as well.)

Definitions from Wiktionary (Gregorian chant) ▸ noun:  (music) A style of unaccompanied monophonic singing in the Catholic Church. ▸ Also see gregorian_chant ▸ Words similar to gregorian chants ▸ Usage examples for gregorian chants ▸ Idioms related to gregorian chants ▸ Wikipedia articles (New!) ▸ Words that often appear near gregorian chants ▸ Rhymes of gregorian chants ▸ Invented words related to gregorian chants