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

 

obbligato

 noun
(North American English also obligato)noun
BrE BrE//ˌɒblɪˈɡɑːtəʊ//
 
; NAmE NAmE//ˌɑːblɪˈɡɑːtoʊ//
 
(pl. obbligatos, (North American English also)obligatos)(music, from Italian)
 
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an important part for an instrument in a piece of music which cannot be left out Word OriginItalian, literally ‘obligatory’, from Latin obligatus, past participle of obligare, from ob- ‘towards’ + ligare ‘to bind’.
See the Oxford Advanced American Dictionary entry: obbligato