To return to a previous or less advanced state; to move backward in development, progress, or condition. Can refer to statistical, psychological, or general backward movement.
From Latin 'regressus' (a going back), from 're-' (back) and 'gradi' (to step, walk). Entered English in the 16th century, initially used in philosophical contexts before expanding to psychology and statistics.
Statistical regression literally means 'going back to the mean'—extreme measurements tend to become more average over time! This mathematical concept explains why exceptionally tall parents often have shorter children, revealing hidden patterns in randomness.
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