singleton

noun

1. playing cardsA playing card that is the only one of its suit in a hand, especially at bridge.

2. playing cardsA hand containing only one card of a certain suit.

3. A single object, especially one of a group.

4. computingA class that may not be instantiated more than once, i.e. that implements the singleton design pattern.

5. mathematicsA set with exactly one element.

6. A child or animal that is born singly, not as a twin or other multiple birth.

   “singleton preterm birth”

7. A person without a romantic partner.

8. A person without a dissociative identity.

9. phoneticsA single consonant, as opposed to a geminated consonant.

   “singleton sonorants”

10. A single object (as distinguished from a pair)

11. A set containing a single member