singleton

• 指单个对象或实例，与一对或一组相对；在数学中指只含一个元素的集合，在纸牌游戏中指手中某花色的唯一一张牌，在编程中常指单例类。

A noun referring to a single object or instance, as distinguished from a pair or group; also used in mathematics for a set containing exactly one element, and in card games for the only card of a suit in a hand.

1. Single objectB2formal

   A single item or entity, as opposed to a pair or group.

   单个对象

   • The collection contained a singleton from the artist's early period.
   • In the database, this record is a singleton with no duplicates.
   • The algorithm returns a singleton when only one result is found.

   同义词entityindividualitemonesingleunit

   反义词collectiongroupmultitudeset

2. Set with one elementC1formalscientific

   A mathematical set that contains exactly one member.

   单元素集合

   • The set {5} is a singleton in mathematics.
   • In set theory, a singleton is a set with a single element.
   • The function returns a singleton when the input is unique.

3. Card in bridgeC1formalsport

   A playing card that is the only card of its suit in a bridge hand as initially dealt.

   单张

   • He was dealt a singleton in the heart suit.
   • Having a singleton can be a strategic advantage in bridge.
   • The player's hand contained a singleton spade.

   同义词stiff