An example of amnesia is when a person is in a car accident where they injured their head, and when they wake up at the hospital they can’t remember who they are or anything about their life.
When a teenager tells their parents they will clean up their room, and when called on not doing it they claim to not remember having said such a thing, it is an example of amnesia.
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See amnesia in Webster's New World College Dictionary
See amnesia in American Heritage Dictionary 4
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