• Retention, in learning, the ability to retain facts and figures in memory (see spaced repetition
  Spaced repetition
  Spaced repetition is a learning technique that incorporates increasing intervals of time between subsequent review of previously learned material; this exploits the psychological spacing effect...
  
  )
  • Selective retention
    Selective retention
    Selective retention, in relating to the mind, is the process when 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 keep in the memory, narrowing the informational...
    
    
• Cultural retention
  Cultural retention
  Cultural retention is the act of retaining the culture of a specific ethnic group of people, especially when there is reason to believe that the culture, through inaction, may be lost. Many African-American, European and Asian organizations have cultural retention programs in place....
  
  
• Customer retention
  Customer retention
  Customer Retention is the activity that a selling organization undertakes in order to reduce customer defections. Successful customer retention starts with the first contact an organisation has with a customer and continues throughout the entire lifetime of a relationship...
  
  
• Employee retention
  Employee retention
  Employee retention refers to the ability of an organization to retain its employees. Employee retention can be represented by a simple statistic...
  
  , the ability to keep employees within an organization
  • Forced retention
    Forced retention
    Forced retention refers to the act of applying pressure to employees to deter them from leaving a company. The most common way to do this is through legal means, such as non-compete and non-disclosure agreements. Given an adequately broad agreement, a company may threaten employees who try to leave...
    
    
• Grade retention
  Grade retention
  Grade retention or grade repetition is the process of having a student repeat an educational course, usually one previously failed. Students who repeat a course are referred as "repeaters"...
  
  , 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 basin
  A retention basin is used to manage stormwater runoff to prevent flooding and downstream erosion, and improve water quality in an adjacent river, stream, lake or bay. Sometimes called a wet pond or wet detention basin, it is an artificial lake with vegetation around the perimeter, and includes a...
  
  ,
• Retention election
  Retention election
  A judicial retention election is a periodic process whereby a judge is subject to a referendum held at the same time as a general 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 ratio
  Retention ratio
  Retention Ratio indicates the percentage of a company's earnings that are not paid out in dividends but credited to retained earnings. It is the opposite of the dividend payout ratio, so that also called the retention rate....
  
  , in company earnings
• Retention of vision
  Retention of vision
  Retention of vision is a conjuring term referring to the perceived image of an object during a vanish...
  
  , in magic
• Urinary retention
  Urinary retention
  Urinary retention, also known as ischuria, is a lack of ability to urinate. It is a common complication of benign prostatic hyperplasia , although it can also be caused by nerve dysfunction, constipation, infection, or medications...
  
  , the lack or inability to urinate
• Variable retention
  Variable retention
  Variable retention is a relatively new silvicultural system that retains forest structural elements for at least one rotation in order to preserve environmental values associated with structurally complex forests...
  
  , 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
  Data retention defines the policies of persistent data and records management for meeting legal and business data archival requirements. A data retention policy weighs legal and privacy concerns against economics and need to know concerns to determine both the retention time, archival rules, data...
  
  , in law and computing
  • Data retention (telecommunication)
    Telecommunications data retention
    In the field of telecommunications, data retention generally refers to the storage of call detail records of telephony and internet traffic and transaction data by governments and commercial organisations...
    
    
• Retention period
  Retention period
  The retention period of a document is an aspect of records management. It represents the period of time a document should be kept or "retained". At the termination of the retention period, the document is usually destroyed...
  
  , of a document, in records management
• Retented, the act of applying retention policies to something or someone
• Retention of title clause
  Title retention clause
  A retention of title clause is a provision in a contract for the sale of goods that the title to the goods remains vested in the seller until certain obligations are fulfilled by the buyer.-Purpose:The main purposes of retention of title clauses are to ensure that where goods are supplied...
  
  , in law

Chemistry

• Retention agent
  Retention agent
  A retention agent is a process chemical that improves the retention of a functional chemical in a substrate. The result is that totally less chemicals are used to get the same effect of the functional chemical and less chemicals goes to waste.-Applications:...
  
  , a process chemical
• CO₂ retention
• Retention of configuration, in chemical reactions
• ER retention
  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....
  
  , proteins retained in the endoplasmic reticulum after folding