Meaning of DEVIATION in English

de ‧ vi ‧ a ‧ tion AC /ˌdiːviˈeɪʃ ə n/ BrE AmE noun

[ Word Family: verb : ↑ deviate ; noun : ↑ deviation ]

1 . [uncountable and countable] a noticeable difference from what is expected or acceptable

deviation from

deviation from the normal procedure

2 . [countable] technical the difference between a number or measurement in a ↑ set and the average of all the numbers or measurements in that set

⇨ ↑ standard deviation

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.