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

 

tonality

 noun
noun
BrE BrE//təʊˈnæləti//
 
; NAmE NAmE//toʊˈnæləti//
 
[uncountable, countable](pl. tonalities)(music)
 
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the quality of a piece of music that depends on the key in which it is written His music exhibits great originality and harmonic interest without abandoning the principles of tonality. The piece then shifts in tonality, setting a more hopeful mood.
See the Oxford Advanced American Dictionary entry: tonality