Definition of Gregorian chant noun from the Oxford Advanced Learner's Dictionary

 

Gregorian chant

 noun
noun
BrE
 
; NAmE
 
[uncountable, countable]
 
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a type of church music for voices alone, used since the Middle Ages Word Origin mid 18th cent.: named after St Gregory the Great (in Latin Gregorius), who is said to have standardized it.
See the Oxford Advanced American Dictionary entry: Gregorian chant