Definition of retainer noun from the Oxford Advanced American Dictionary

      

    retainer

     noun
    noun
    NAmE//rɪˈteɪnər//
     
     
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  1. 1 a sum of money that is paid to someone to make sure they will be available to do work when they are needed The agency will pay you a monthly retainer.
  2. 2 a device that keeps a person's teeth straight after they have had treatment with braces
  3. 3(old-fashioned) a servant, especially one who has been with a family for a long time
See the Oxford Advanced Learner's Dictionary entry: retainer