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What is a singleton?

What is a singleton? Here are some definitions.

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. A person without a romantic partner.
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