Definition of rallentando adverb from the Oxford Advanced Learner's Dictionary

 

rallentando

 adverb
adverb
BrE BrE//ˌrælənˈtændəʊ//
 
; NAmE NAmE//ˌrælənˈtændoʊ//
 
(music, from Italian)
 
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(used as an instruction) gradually becoming slower Word OriginItalian, literally ‘slowing down’, from the verb rallentare.
See the Oxford Advanced American Dictionary entry: rallentando