Noun : The other player held a doubleton.    From Dictionary.com. 

West signaled with the ten to show a doubleton, and East let dummy's king and queen win.    From Wordnik.com.  [Bridge] Reference

There were two ways in which this might be achieved: South might have a doubleton, or he might have the singleton king.    From Wordnik.com.  [Tight finish in the English Premier League] Reference

If the hearts had split 3-3 (or if a defender had held K-Q doubleton), South could have drawn trumps and led to the king of diamonds to take the good hearts.    From Wordnik.com.  [Bridge] Reference

And all the solutions that say, well, let's just not make any tough decisions and go up to 90 percent cost you a doubleton of money in taxes, subsidize the poor -- most of whom already can at least get Medicare -- and do not one single solitary thing for the working middle class, 80 percent of whom are those who don't have insurance and who are terribly insecure.    From Wordnik.com.  [Presidents Remarks At Democratic National Committee Gala] Reference

With a doubleton trump, the defender follows up the line.    From Wordnik.com.  [STLtoday.com Top News Headlines] Reference

Then, to stand any chance, he had to find an opponent with ten-doubleton of hearts.    From Wordnik.com.  [NYT > Home Page] Reference

Then Borker West raised imaginatively with king-doubleton, to make sure his side led a heart, to take up bidding space and to stop.    From Wordnik.com.  [NYT > Home Page] Reference

You could also double, but it would be dangerous to do so with only a doubleton heart, as partner will assume you have better support for that suit and may insist on playing there.    From Wordnik.com.  [TheSunNews.com: Local] Reference

Publix pharmacy sweetenings doubleton islands grieving rhythms.    From Wordnik.com.  [The Volokh Conspiracy » Oh, can I answer that, teacher? Can I? Can I?] Reference

“doubleton” in another model, or it could be “the empty set” in one model while being omitted entirely from another model's domain.    From Wordnik.com.  [Skolem's Paradox] Reference

Basically everyone else uses 3 / 2 / 1 for void / singleton / doubleton scoring, while she uses 5 / 3 / 1.    From Wordnik.com.  [Rooneg::Weblog] Reference