singleton

/ˈsɪŋɡəltən/
noun
  1. A single person or thing, especially one that is alone or separate from others.
    • The puzzle had one missing piece, a singleton left on the table.
    • In the group project, he was the singleton who worked alone.
    • She was a singleton in a crowd of couples at the party.
  2. In card games, a hand that contains only one card of a particular suit.
    • She led with her singleton club to surprise her opponents.
    • A singleton can be a disadvantage in bridge unless you have strong trumps.
    • He had a singleton in hearts, which made his hand difficult to play.
  3. In computing, a design pattern that restricts a class to a single instance.
    • The programmer used a singleton to manage the database connection.
    • A singleton ensures that only one object of a class is created.
    • The logger class was implemented as a singleton to avoid duplicate log files.
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