A condition in which a person cannot remember past information or events, usually because of illness, injury, or trauma. The memory loss can be temporary or permanent.
From Greek *amnesia*, from *a-* (“not”) and *mnēsis* (“memory”), related to *mnasthai* (“to remember”). It literally means “without memory.”
“Amnesia” literally means “no memory,” built from the same root that gives us “mnemonic” tricks for remembering. Movies often exaggerate it, but real amnesia can be surprisingly specific—like losing only certain time periods. It shows how memory is not one thing but many systems stitched together.
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