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An alteration made to the result of an observation or calculation in order to improve its accuracy. For example, if experience tells me a clock is usually 5 minutes slow I will add 5 minutes to the time it displays when I look at it, or government estimates of the number of homeless people will be higher than the recorded totals in the census, because it is known that the census will not be able to accurately record all the homeless people.

Subjects: Mathematics.

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