Absolute Error
The Difference between the measured or inferred value of a quantity 
andits actual value 
, given by
(sometimes with the Absolute Value taken) is called the absolute error. The absolute error of the Sumor Difference of a number of quantities is less than or equal to the Sum of their absolute errors.See also Error Propagation, Percentage Error, Relative Error
References
Abramowitz, M. and Stegun, C. A. (Eds.). Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing. New York: Dover, p. 14, 1972.
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