singleton

English Thesaurus

1. the playing card that is the only card in a suit held in a bridge hand as initially dealt (noun.artifact)

hypernym	:	playing card,
definition	:	one of a pack of cards that are used to play card games (noun.artifact)

2. a set containing a single member (noun.group)

hypernym	:	set,
definition	:	a group of things of the same kind that belong together and are so used (noun.group)

3. a single object (as distinguished from a pair) (noun.quantity)

hypernym	:	1, ace, i, one, single, unity,
definition	:	the smallest whole number or a numeral representing this number (noun.quantity)

hyponym	:	fellow, mate,
definition	:	one of a pair (noun.quantity)