uncertainty

/ˌən-ˈsər-tᵊn-tē/

noun

  1. the quality or state of being uncertain : doubt

  2. something that is uncertain

uncertainty doubt dubiety skepticism suspicion mistrust mean lack of sureness about someone or something. uncertainty may range from a falling short of certainty to an almost complete lack of conviction or knowledge especially about an outcome or result. doubt suggests both uncertainty and inability to make a decision.

noun

  1. a principle in quantum mechanics: it is impossible to discern simultaneously and with high accuracy both the position and the momentum of a particle (such as an electron) —called also Heisenberg uncertainty principle

noun

  1. uncertainty principle —called also Heisenberg's uncertainty principle