Hypertext Webster Gateway: "singleton"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Singleton \Sin"gle*ton\, n.
In certain games at cards, as whist, a single card of any
suit held at the deal by a player; as, to lead a singleton.
From WordNet (r) 1.7 (wn)
singleton
n 1: a single object (as distinguished from a pair)
2: a set containing a single member
3: the playing card that is the only card in a suit held in a
bridge hand as initially dealt
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