a single person or thing of the kind under consideration:splitting the clumps of plants into singletons
[often as modifier] a child or animal born singly, rather than one of a multiple birth:singleton boys
informal a person who is not married or in a long-term relationship.
(in card games, especially bridge) a card that is the only one of its suit in a hand:declarer drew trumps, finding that West had a singleton [as modifier]:a singleton spade
Mathematics & Logic a set which contains exactly one element:Lewis argues that the relation of a singleton to its only member is mysterious
Origin:
late 19th century: from single, on the pattern of simpleton
singleton in other Oxford dictionaries
Definition of singleton in the US English dictionary
