Definitions of singleton

n 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

n a single object (as distinguished from a pair)

fellow, mate
one of a pair
Type of:
1, I, ace, one, single, unity
the smallest whole number or a numeral representing this number

n a set containing a single member

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

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