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amnesia

noun
🔊/æmˈniːziə/
🔊/æmˈniːʒə/
 [uncountable]
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  1. a medical condition in which somebody partly or completely loses their memory遗忘（症）；记忆缺失Topics Illnessc2
    Word Originlate 18th cent.: from Greek amnēsia ‘ forgetfulness’.