IPA: /haɪˈpɜːrmˌniːzjə/
KK: /haɪˈpɜrmˌniːʒə/
A condition where a person has an unusually strong and clear memory of past events, often linked to certain mental health issues.
After the accident, she experienced hypermnesia, recalling every detail of the event vividly.
Hypermnesia is formed from "hyper-" (meaning over or excessive) and "mnesia" (from Greek "mnēsis", meaning memory). The word refers to an excessive or enhanced ability to remember things.
Think of 'hyper-' meaning excessive and 'mnesia' relating to memory — this helps you remember that hypermnesia refers to an excessive memory.