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English definition of “margin”

margin

noun [C] (AMOUNT/DEGREE)   /ˈmɑr·dʒɪn/
the amount or degree of difference between a higher amount and a lower amount : He was reelected by a wide margin. A margin for error is the amount by which you can make a mistake without risking complete failure : There is no margin for error – it’s got to work the first time . A margin of error is the degree to which a calculation can be wrong without changing how accurate the final result is: The poll had a margin of error of plus or minus 4%.
(Definition of margin noun (AMOUNT/DEGREE) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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