(uncountable) Doubt; the condition of being uncertain or without conviction. / (countable) Something uncertain or ambiguous.

plural of uncertainty

(cricket) The area near the batsman's off stump where, if a ball passes that area, the batsman is unsure whether to play it (and risk an edge) or leave it (and risk being bowled).

(quantum mechanics) The Heisenberg uncertainty principle.

plural of corridor of uncertainty

A lack of any quantifiable knowledge about some possible occurrence, as opposed to the presence of quantifiable risk.

plural of Knightian uncertainty

(physics, quantum mechanics) The principle that there is an absolute limit on the combined accuracy of certain pairs of simultaneous, related measurements, especially that of the position and momentum of a particle. Originally posited as a problem of measurement, it was soon refined as an inherent property of the universe.