Definition of retention noun from the Oxford Advanced American Dictionary

      

    retention

     noun
    noun
    NAmE//rɪˈtɛnʃn//
     
    [uncountable](formal)
     
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  1. 1the action of keeping something rather than losing it or stopping it The company needs to improve its training and retention of staff.
  2. 2the action of keeping liquid, heat, etc. inside something rather than letting it escape Eating too much salt can cause fluid retention. the importance of energy conservation and heat retention
  3. 3 the ability to remember things Visual material aids the retention of information. see also retain
See the Oxford Advanced Learner's Dictionary entry: retention