• WordNet 3.6
    • n doubleton (bridge) a pair of playing cards that are the only cards in their suit in the hand dealt to a player
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Century Dictionary and Cyclopedia
    • n doubleton In whist and bridge, a two-card suit.
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In literature:

In October I met him at Doubleton; we spent three days there together.
"The Path Of Duty" by Henry James
He had clubs and spades solid, with doubleton heart and diamonds.
"Competition" by James Causey
This, therefore, was the legation, the residence of our minister, Sir Shalley Doubleton.
"A Day's Ride A Life's Romance" by Charles James Lever

In science:

For every subset X of 2N , by [X ]2 we denote the set of all doubletons of X .
A classification of separable Rosenthal compacta and its applications
We recall that for every subset X of 2N we identify the set [X ]2 of doubletons of X with the set of all (σ, τ ) ∈ X 2 with σ ≺ τ .
A classification of separable Rosenthal compacta and its applications
Replacing the doubletons {xγ , zγ } in S by singletons gives the conclusion.
On cardinal invariants and generators for von Neumann algebras
We can also check that a fraction ρ (1 − ρ) of the n filled boxes is filled with doubletons: E (A2,N | PN = n) ∼ ρ (1 − ρ) n and more generally that E (Ai,N | PN = n) ∼ ρ (1 − ρ)i n.
A Bose-Einstein Approach to the Random Partitioning of an Integer
In this paper we study the relationship between query and search engine by exploring the adaptive properties for doubleton as a space of event based on a simple search engine.
Simple Search Engine Model: Adaptive Properties for Doubleton