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Related to systematic error: Parallax error
systematic error[‚sis·tə′mad·ik ′er·ər]
An error due to some known physical law by which it might be predicted; these errors produced by the same cause affect the mean in the same sense, and do not tend to balance each other but rather give a definite bias to the mean.
An error which results from some bias in the measurement process and is not due to chance, in contrast to random error.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.