Deviation

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Deviation used in many context in SuperMemo usually stands for root-mean-square deviation (RMSD) or residual. The root mean square (RMS) is the square root of the mean square (i.e. quadratic mean).

See: RMSD @ Wikipedia

Exemplary application in SuperMemo:

This glossary entry is used to explain SuperMemo, a pioneer of spaced repetition software since 1987