What is the meaning of possibility?

noun

• A future prospect or potential.
  • usage: "this room has great possibilities"
• Capability of existing or happening or being true.
  • usage: "there is a possibility that his sense of smell has been impaired"
  • synonyms: possibleness
• A tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena.
  • usage: "a scientific hypothesis that survives experimental testing becomes a scientific theory"; "he proposed a fresh theory of alkalis that later was accepted in chemical practices"
  • synonyms: hypothesis, theory
• A possible alternative.
  • usage: "bankruptcy is always a possibility"
  • synonyms: possible action, opening