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English definition of “margin of error”

margin of error

noun [C]    
C2 an extra amount of something, such as time or money, which you allow because there might be a mistake in your calculations: When archaeologists date objects that are thousands of years old, they allow a margin of error of several hundred years. The government estimates that its borrowing requirement this year could reach £150 billion, subject to a wide margin of error.Also, extra, and in addition
(Definition of margin of error noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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