Definition of sostenuto adverb from the Oxford Advanced American Dictionary

 

sostenuto

 adverb,adjective
adverb, adjective
NAmE//ˌsɑstəˈnut̮oʊ//
 
, NAmE//ˌsoʊstəˈnut̮oʊ//
 
(music)(from Italian)
 
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(used as an instruction) making each note last for its full written length
See the Oxford Advanced Learner's Dictionary entry: sostenuto