Singleton

Origin

single + -ton

Full definition of singleton

Noun

1. (playing cards) A playing card that is the only one of its suit in a hand, especially at bridge.
2. A single object, especially one of a group.
3. (computing) A class that may not be instantiated more than once, i.e. that implements the singleton design pattern.
4. (mathematics) A set with exactly one element.
5. A child or animal that is born singly, not as a twin or other multiple birth.
6. (neologism) A person without a romantic partner.