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

     

    singleton

     noun
    noun
    BrE BrE//ˈsɪŋɡltən//
     
    ; NAmE NAmE//ˈsɪŋɡltən//
     
     
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  1. 1a single item of the kind that you are talking about
  2. 2a person who is not married or in a romantic relationship
  3. 3a person or an animal that is not a twin, etc.
  4. Word Origin late 19th cent.: from single, on the pattern of simpleton.
See the Oxford Advanced American Dictionary entry: singleton