WordReference Random House Learner's Dictionary of American English © 2014
sin•gle•ton /ˈsɪŋgəltən/USA pronunciation  n. [countable]
  1. a person or thing occurring alone.
  2. a card that is the only one of a suit in a hand.

Collins Concise English Dictionary © HarperCollins Publishers::

singleton /ˈsɪŋɡəltən/ n
  1. 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. a set containing only one member
  4. a person who is neither married nor in a relationship
Etymology: 19th Century: from single, on the model of simpleton

'singleton' also found in these entries:
In the English description:

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