English

Definition of retention noun from the Oxford Advanced Learner's Dictionary

      

    retention

     noun
    noun
    BrE BrE//rɪˈtenʃn//
     
    ; NAmE NAmE//rɪˈtenʃn//
     
    [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. 3the ability to remember things Visual material aids the retention of information.
  4. see also retain
    Word Origin late Middle English (denoting the power to retain something): from Old French, from Latin retentio(n-), from retinere ‘hold back’, from re- ‘back’ + tenere ‘hold’.
See the Oxford Advanced American Dictionary entry: retention