singleton

/S IH1 NG G AH0 L T AH0 N/
noun
  1. 1

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

  2. 2

    A hand containing only one card of a certain suit.

  3. 3

    A single object, especially one of a group.

  4. 4

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

  5. 5

    A set with exactly one element.

  6. 6

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

    โ€œsingleton preterm birthโ€

  7. 7

    A person without a romantic partner.

  8. 8

    A person without a dissociative identity.

  9. 9

    A single consonant, as opposed to a geminated consonant.

    โ€œsingleton sonorantsโ€

Antonyms

Source: https://en.wiktionary.org/wiki/singleton