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retention /rɪˈtɛnʃən/  

  • noun
    [noncount] formal
    the act of keeping someone or something
    the retention of profits from all sales
    the act of keeping extra liquid, heat, etc., inside the body
    pills to offset water retention
    the retention of fluid
    the ability to keep something
    The fabric has good color retention. [=the fabric's colors do not fade]
    the ability to remember things easily or for a long time
    the retention of things learned in school
    They say the herb promotes memory retention.