singleton

[sing-guhl-tuhn]
noun
1.
a person or thing occurring singly, especially an individual set apart from others.
2.
a.
a child or animal that is the only one born at one birth: a research program involving twins and singletons.
b.
an only child in a family.
3.
Chiefly British. an unmarried person; a single.
4.
Cards. a card that is the only one of a suit in a hand.
5.
Mathematics. a set consisting of one given element.

Origin:
1875–80; single + -ton

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
singleton (ˈsɪŋɡəltən)
 
n
1.  bridge an original holding of one card only in a suit
2.  a single object, individual, etc, separated or distinguished from a pair or group
3.  maths a set containing only one member
4.  a person who is neither married nor in a relationship
 
[C19: from single, on the model of simpleton]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

singleton
"single card of a suit in a hand," 1876, originally in whist, from single (adj.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
She understood that a twin pregnancy was more vulnerable than a singleton.
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