hyperthymesia UK /ˌhaɪ.pə.θaɪˈmiː.zi.ə/US /ˌhaɪ.pɚ.θaɪˈmi.ʒə/ noun1 •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.Lesley hadn't been interested in the story, because she didn't think that HSAM (or hyperthymesia, as it was called then) was that rare, having known me for so many years. — 2012
