so·​ste·​nu·​to | \ ˌsō-stə-ˈnü-(ˌ)tō How to pronounce sostenuto (audio) , ˌsȯ-\

Definition of sostenuto

 (Entry 1 of 2)

: sustained to or beyond the note's full value used as a direction in music

sostenuto

noun
plural sostenutos

Definition of sostenuto (Entry 2 of 2)

: a movement or passage whose notes are markedly prolonged

First Known Use of sostenuto

Adjective or adverb

circa 1724, in the meaning defined above

Noun

1757, in the meaning defined above

History and Etymology for sostenuto

Adjective or adverb

Italian, from past participle of sostenere to sustain, from Latin sustinēre

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