hyperthymesia
A rare condition in which a person possesses a superior autobiographical memory and is able to recall the vast majority of personal events and experiences in life.
uncountable
Others may have some degree of hyperthymesia — they may spend an abnormally large amount of time thinking about their personal past, and have an extraordinary capacity to recall specific events in detail.
Where it comes from
From hyper- (prefix meaning ‘over, beyond; excessive’) + Greek θύμηση (thýmisi, “memory”) + -ia (suffix forming names of diseases).
Adapted from the Wiktionary entry hyperthymesia (CC BY-SA 4.0).