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

 

falsetto

 noun
noun
BrE BrE//fɔːlˈsetəʊ//
 
; NAmE NAmE//fɔːlˈsetoʊ//
 
(pl. falsettos) People in the music world
 
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an unusually high voice, especially the voice that men use to sing very high notes See related entries: People in the music world Word Origin late 18th cent.: from Italian, diminutive of falso ‘false’, from Latin falsus, fallere ‘deceive’.
See the Oxford Advanced American Dictionary entry: falsetto