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English definition of “margin of error”

margin of error

noun [C, usually singular]    
the amount by which a set of data might not be accurate: The poll had a margin of error of plus or minus 3 percentage points.
the fact that it is possible to make some mistakes without having a very damaging effect on the final result: With the company's current precarious situation there is no margin of error.
(Definition of margin of error noun from the Cambridge Business English Dictionary © Cambridge University Press)
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