Retention may refer to:

General

Recall (memory) Recall in memory refers to the mental process of retrieving information from the past. Along with encoding (memory), encoding and storage (memory), storage, it is one of the three core processes of memory. There are three main types of recall: fr ...

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

Memory and retention in learning Memory is the faculty of the mind by which data or information is encoded, stored, and retrieved when needed. It is the retention of information over time for the purpose of influencing future action. If past events could not be remembered ...

* Selective retention * Cultural retention *

Customer retention Customer retention refers to the ability of a company or product to retain its customers over some specified period. High customer retention means customers of the product or business tend to return to, continue to buy or in some other way not defe ...

University student retention University student retention, sometimes referred to as persistence, is a process to improve student graduation rates and decrease a loss of tuition revenue via university programs. In United States Transfer rates Transfer rates are very high ...

Employee retention Employee retention is the ability of an organization to retain its employees and ensure sustainability. Employee retention can be represented by a simple statistic (for example, a retention rate of 80% usually indicates that an organization kept 8 ...

, the ability to keep employees within an organization *

Forced retention In contract law, a non-compete clause (often NCC), restrictive covenant, or covenant not to compete (CNC), is a clause under which one party (usually an employee) agrees not to enter into or start a similar profession or trade in competition again ...

Grade retention Grade retention or grade repetition is the process of a student repeating a grade after failing the previous year. In the United States of America, grade retention can be used in kindergarten through to third grade; however, students in high sch ...

, in schools, keeping a student in the same grade for another year (that is, not promoting the student to the next higher grade with their classmates) *Retention or

retainage Retainage is a portion of the agreed upon contract price deliberately withheld until the work is complete to assure that the contractor or subcontractor will satisfy its obligations and complete a construction project. A retention is money withheld ...

of an agreed portion of a contract price until project completion *

Retention basin A retention basin, sometimes called a retention pond, wet detention basin, or storm water 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 ...

Retention election A retention election or retention referendum is a referendum where voters are asked if an office holder, usually a judge, should be allowed to continue in that office. The judge is removed from office if a majority of votes are cast against rete ...

, 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 rate is a statistical measurement of the proportion of people that remain involved with a group from one time period to another. The concept is used in many contexts, including marketing, investment, education, employee management, rese ...

Retention ratio Retention ratio indicates the percentage of a company's earnings that are not paid out in dividends to shareholders but credited to retained earnings. It is the opposite of the dividend payout ratio, and is a key indicator of how much profit a co ...

, in company earnings * Retention of vision, in magic *

Water retention (medicine) Edema (American English), also spelled oedema (British English), and also known as fluid retention, swelling, dropsy and hydropsy, is the build-up of fluid in the body's tissue. Most commonly, the legs or arms are affected. Symptoms may inclu ...

, abnormal accumulation of fluid in the body *

Urinary retention Urinary retention is an inability to completely empty the bladder. Onset can be sudden or gradual. When of sudden onset, symptoms include an inability to urinate and lower abdominal pain. When of gradual onset, symptoms may include urinary incont ...

, 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 Data retention defines the policies of persistent data and records management for meeting legal and business data archival requirements. Although sometimes interchangeable, it is not to be confused with the Data Protection Act 1998. The differe ...

, 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 ...

, 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 fulfil ...

, in law

Chemistry

* Retention agent, a process chemical * CO₂ retention * Retention of configuration, in chemical reactions *

ER retention ER retention refers to proteins that are retained in the endoplasmic reticulum, or ER, after folding; these are known as ER resident proteins. Protein localization to the ER often depends on certain sequences of amino acids located at the N termin ...

, proteins retained in the endoplasmic reticulum after folding * Retention factor

Maths

* Retention distance * Retention uniformity

General

Information and records

Chemistry

Maths

See also