Singleton

n.

1.

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.

Noun	1.	singleton - a single object (as distinguished from a pair)
	2.	singleton - a set containing a single member
	3.	singleton - the playing card that is the only card in a suit held in a bridge hand as initially dealt

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