Retention may refer to:

General

* Recall (memory), in learning, the ability to recall facts and figures in memory *

Memory and retention in learning Human memory is the process in which information and material is encoded, stored and retrieved in the brain. Memory is a property of the central nervous system, with three different classifications: short-term, long-term and sensory memory. The th ...

Selective retention Selective retention, in relating to the mind, is the process whereby people more accurately remember messages that are closer to their interests, values and beliefs, than those that are in contrast with their values and beliefs, selecting what to ...

* Cultural retention * Customer retention * University student retention * Employee retention, the ability to keep employees within an organization *

Forced retention Forced retention refers to the act of applying pressure to employment, employees to deter them from leaving a company. The most common way to do this is through legal means, such as Non complete clause, non-compete and non-disclosure agreements. G ...

Grade retention Grade retention or grade repetition is the process of a student repeating a grade due to failing on the previous year. An alternative to grade retention due to failure is a policy of social promotion, with the idea that staying within their same ...

, 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 A retention basin, sometimes called a wet pond, wet detention basin, or stormwater management pond (SWMP), is an artificial pond with vegetation around the perimeter and a permanent pool of water in its design. It is used to manage stormwater r ...

, *

Retention election A judicial retention election (or retention referendum) is a periodic process in some jurisdictions whereby a judge is subject to a referendum held at the same time as a general election. The judge is removed from office if a majority of votes are ...

, 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 The term "retention rate" is used in a variety of fields, including marketing, investing, education, in the workplace and in clinical trials. Maintaining retention in each of these fields often results in a positive outcome for the overall organiza ...

* 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 A retention period (associated with a retention schedule or retention program) is an aspect of records and information management (RIM) and the records life cycle that identifies the duration of time for which the information should be maintained o ...

, of a document, in records management *

Retention of title clause A retention of title clause (also called a reservation of title clause or a ''Romalpa'' clause in some jurisdictions) is a provision in a contract for the sale of goods that the title to the goods remains vested in the seller until the buyer fulfils ...

, in law

Chemistry

Retention agent A retention agent is a chemical process that improves the retention of a functional chemical in a substrate. The result is that totally fewer chemicals are used to get the same effect as the functional chemical and fewer chemicals go to waste. App ...

, a process chemical *

CO₂ retention Hypercapnia (from the Greek ''hyper'' = "above" or "too much" and ''kapnos'' = "smoke"), also known as hypercarbia and CO2 retention, is a condition of abnormally elevated carbon dioxide (CO2) levels in the blood. Carbon dioxide is a gaseous pro ...

Retention of configuration Walden inversion is the inversion of a stereogenic center in a chiral molecule in a chemical reaction. Since a molecule can form two enantiomers around a stereogenic center, the Walden inversion converts the configuration of the molecule from ...

, in chemical reactions * ER retention, proteins retained in the endoplasmic reticulum after folding * Retention factor

Maths

Retention distance Retention distance, or ''RD'', is a concept in thin layer chromatography, designed for quantitative measurement of ''equal-spreading'' of the spots on the chromatographic plate and one of the Chromatographic response functions. It is calculated f ...

Retention uniformity Retention uniformity, or ''RU'', is a concept in thin layer chromatography. It is designed for the quantitative measurement of ''equal-spreading'' of the spots on the chromatographic plate and is one of the Chromatographic response functions. For ...

General

Information and records

Chemistry

Maths

See also