HYPERMNESIA Meaning of HYPERMNESIA in English [ ˌhʌɪpəm'ni:zɪə ]■ noun Medicine unusual power of memory, typically under abnormal conditions such as trauma or narcosis.OriginC19: from hyper- + Gk mnēsia 'memory'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004