Definition of imbalance noun from the Oxford Advanced American Dictionary

 

imbalance

 noun
noun
NAmE//ɪmˈbæləns//
 
[countable, uncountable]
 
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a situation in which two or more things are not the same size or are not treated the same, in a way that is unfair or causes problems imbalance (in/of something) a global imbalance in/of power imbalance (between A and B) Attempts are being made to redress (= put right)the imbalance between our import and export figures. Postnatal depression is usually due to hormonal imbalance.
See the Oxford Advanced Learner's Dictionary entry: imbalance