systematic error
noun
: an error that is not determined by chance but is introduced by an inaccuracy (as of observation or measurement) inherent in the system
Example Sentences
Recent Examples on the Web The polls could be off by another 2-3 points, due to a systematic error in turnout assumptions, putting Biden in reality just 4-5 points ahead of Trump instead of 9. 
Damon Linker, TheWeek, 30 Oct. 2020 So those voters were denied the ability to vote remotely, but that was due to systematic errors in ballot distribution, not directly via Supreme Court action. Eric Litke, USA TODAY, 11 Apr. 2020 Cognitive biases refer to a range of systematic errors in human decision-making stemming from the tendency to use mental shortcuts. Andrew R. Olenski, New York Times, 20 Feb. 2020
Damon Linker, TheWeek, 30 Oct. 2020 So those voters were denied the ability to vote remotely, but that was due to systematic errors in ballot distribution, not directly via Supreme Court action. Eric Litke, USA TODAY, 11 Apr. 2020 Cognitive biases refer to a range of systematic errors in human decision-making stemming from the tendency to use mental shortcuts. Andrew R. Olenski, New York Times, 20 Feb. 2020 Word History
First Known Use
1826, in the meaning defined above