systematic error

https://dx.doi.org/10.1351/goldbook.S06235
Mean that would result from an infinite number of measurements of the same measurand carried out under repeatability conditions minus a true value of the measurand.
Source:
See also:
PAC, 1995, 67, 1699 (Nomenclature in evaluation of analytical methods including detection and quantification capabilities (IUPAC Recommendations 1995)) on page 1705
PAC, 1990, 62, 2167 (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2188