What does "uncertainty" mean?

Doubt; the condition of being uncertain or without conviction.

Uncertainty

Common synonyms include: doubt, uncertainness, quandary, accidentality, actuarial calculation, adventitiousness.

//ʌnˈsɝtənti// noun

noun ·Common ·High school level

Noun

1
Doubt; the condition of being uncertain or without conviction. uncountable
"“Well,” I answered, at first with uncertainty, then with inspiration, “he would do splendidly to lead your cotillon, if you think of having one.” ¶ “So you do not dance, Mr. Crocker?” ¶ I was somewhat set back by her perspicuity."
2
being unsettled or in doubt or dependent on chance wordnet
3
Something uncertain or ambiguous. countable
"Despite these uncertainties, Clarke told MPs he was convinced of the need to order trains powered by batteries. He said: "We're calling for a 'no regrets' order of battery trains because we see them always having a future. We see them being fundable, financeable, similar cost to diesel trains, and we know that however much electrification we would aspire to do, there's always going to be at least a third of the network that isn't electrified."
4
the state of being unsure of something wordnet
5
A parameter that measures the dispersion of a range of measured values. uncountable