Englishfor English speakers
uncertainty
Noun
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Uncertainty is a state where there is a lack of certainty.
estimate
Noun
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An estimate is a judgement of a size, value, amount, cost, etc., which is based on incomplete information.
British Telecom will give you an estimate of the cost before doing any work.
estimate
Verb
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If you estimate the number, size, value, amount, cost, etc. of something, you guess based on incomplete information.
It's difficult to estimate how long it will take to get to London because we don't know how bad the traffic will be.