singleton

/ˈsɪŋgəlt(ə)n/

Other forms: singletons

Definitions of singleton

1. noun

   the playing card that is the only card in a suit held in a bridge hand as initially dealt
   type of:

   playing card

   one of a pack of cards that are used to play card games
2. noun

   a single object (as distinguished from a pair)
   types:

   fellow, mate

   one of a pair

   type of:

   1, I, ace, one, single, unity

   the smallest whole number or a numeral representing this number
3. noun

   a set containing a single member
   type of:

   set

   a group of things of the same kind that belong together and are so used