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double +‎ -ton


doubleton (plural doubletons)

  1. (mathematics, rare) A set containing precisely two elements.
  2. (bridge) A pair of cards of the same suit, which are the only cards of that suit in a player's hand
    • 2009, January 8, “Phillip Alder”, in Part 1 of an Experiment, Ending in a Trump Coup[1]:
      If she had had the doubleton ace of diamonds and a low club, she would have made a four-club splinter bid, showing four-card spade support, the values for game and a singleton or void in clubs.

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