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

 

amnesia

 noun
noun
BrE BrE//æmˈniːziə//
 
; NAmE NAmE//æmˈniːʒə//
 
[uncountable]
 
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a medical condition in which somebody partly or completely loses their memory Word Origin late 18th cent.: from Greek amnēsia ‘ forgetfulness’.
See the Oxford Advanced American Dictionary entry: amnesia