Definition of plainsong noun from the Oxford Advanced Learner's Dictionary

 

plainsong

 noun
noun
BrE BrE//ˈpleɪnsɒŋ//
 
; NAmE NAmE//ˈpleɪnsɔːŋ//
 
, NAmE//ˈpleɪnsɑːŋ//
 
(also plainchant)[uncountable]
 
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a type of church music for voices alone, used since the Middle Ages Word Origin late Middle English: translating Latin cantus planus.
See the Oxford Advanced American Dictionary entry: plainsong