Retention may refer to: General Recall (memory), in learning, the ability to recall facts and figures in memory Memory and retention in learning Selective retention Cultural retention Customer retention University student retention Employee retention, the ability to keep employees within an organization Forced retention Grade retention, in schools, keeping a student in the same grade for another year (that is, not promoting the student to the next higher grade with his/her classmates) Retention basin, Retention election, in the United States court system, a process whereby a judge is periodically subject to a vote in order to remain in the position of judge Retention rate Retention ratio, in company earnings Retention of vision, in magic Water retention (medicine), abnormal accumulation of fluid in the body Urinary retention, the lack or inability to urinate Variable retention, in land management and forestry conservation Information and records Retention (news server), in Usenet, the time a news server holds a newsgroup posting before deleting it as no longer relevant Data retention, in law and computing Data retention (telecommunication) Retention period, of a document, in records management Retention of title clause, in law Chemistry Retention agent, a process chemical CO₂ retention Retention of configuration, in chemical reactions ER retention, proteins retained in the endoplasmic reticulum after folding Retention factor Maths Retention distance Retention uniformity See also Water retention (disambiguation) Retainer (disambiguation)