Definition of amnesia noun from the Oxford Advanced American Dictionary

 

amnesia

 noun
noun
NAmE//æmˈniʒə//
 
[uncountable]
 
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a medical condition in which someone partly or completely loses their memory
NAmE//æmˈniʒiˌæk//
 
, NAmE//‑zi‑//
 
noun This new discovery helps amnesiacs keep their memory.
See the Oxford Advanced Learner's Dictionary entry: amnesia