Uncertainty Definition

ŭn-sûrtn-tē
uncertainties
noun
uncertainties
Lack of certainty; doubt.
Webster's New World
Something uncertain.
Webster's New World
The estimated amount or percentage by which an estimated or calculated value may differ from the true value.
American Heritage

(uncountable, mathematics) A parameter that measures the dispersion of a range of measured values.

Wiktionary
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Other Word Forms of Uncertainty

Noun

Singular:
uncertainty
Plural:
uncertainties

Origin of Uncertainty

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uncertainty