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singleton

noun [C] (CARD)
 
 
/ˈsɪŋ.ɡl̩.tən/ specialized

Definition

a playing card that is the only one of that suit that a player has: Jack has a singleton in hearts.Actions involved in playing cards
(Definition of singleton noun (CARD) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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