Definition of atonal adjective from the Oxford Advanced Learner's Dictionary

 

atonal

 adjective
adjective
BrE BrE//eɪˈtəʊnl//
 
; NAmE NAmE//eɪˈtoʊnl//
 
Describing music
 
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(of a piece of music) not written in any particular key opposite tonal See related entries: Describing music
See the Oxford Advanced American Dictionary entry: atonal