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retention (n.)

late 14c., retencioun, "the keeping of fluid or secretions within the body," also "power of capacity," from Latin retentionem (nominative retentio) "a retaining, a holding back," noun of action from past-participle stem of retinere (see retain).

The mental sense of "remembrance, fact of retaining things in the mind" is from late 15c. As "act of retaining or holding as one's own," from 1610s; retention rate is by 1972.

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Definitions of retention

retention (n.)
the act of retaining something;
Synonyms: keeping / holding
retention (n.)
the power of retaining and recalling past experience;
Synonyms: memory / retentiveness / retentivity
retention (n.)
the power of retaining liquid;
Synonyms: retentiveness / retentivity
From wordnet.princeton.edu