Today's word of the day is "regression."
Regression
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the act of going back to a previous place or state; return or reversion.
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retrogradation; retrogression.
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Biology. reversion to an earlier or less advanced state or form or to a common or general type.
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Psychoanalysis. the reversion to a chronologically earlier or less adapted pattern of behavior and feeling.
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a subsidence of a disease or its manifestations: a regression of symptoms.