deviation
noun
uk/ˌdiːviˈeɪʃən/ us [ C or U ]
a difference from what is usual or expected:
The letter cited 'significant deviations from current good manufacturing practice'.
[ U ]
the difference between a particular number and the average or normal number:
In a recent analysis of local temperature changes, Reno ranked first by amount of deviation from the 30-year average.
See also
standard deviation