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duality

noun [U]
 
 
/djuːˈæl.ə.ti/ US  /duːˈæl.ə.t̬i/ formal

Definition

the state of combining two different things: His poems reveal the duality of his nature, the joy and hope, the fear and despair.Single, double and multiple
(Definition of duality noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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