singleton

Noun
  1. A single object (as distinguished from a pair) (synset 113765120)
    is a type of: 1, ace, i, one, single, unity - the smallest whole number or a numeral representing this number
    subtypes: fellow, mate - one of a pair
  2. A set containing a single member (synset 108001577)
    is a type of: set - a group of things of the same kind that belong together and are so used
  3. The playing card that is the only card in a suit held in a bridge hand as initially dealt (synset 104230510)
    is a type of: playing card - one of a pack of cards that are used to play card games

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