am ‧ ne ‧ si ‧ a /æmˈniːziə $ -ʒə/ BrE AmE noun [uncountable]
[ Date: 1700-1800 ; Language: Modern Latin ; Origin: Greek , 'forgetfulness' , probably from amnestia ; ⇨ ↑ amnesty ]
the medical condition of not being able to remember anything
—amnesiac /-ziæk $ -ʒiæk, -ziæk/ noun [countable]