- 1[uncountable, countable] deviation (from something) the act of moving away from what is normal or acceptable; a difference from what is expected or acceptable deviation from the previously accepted norms sexual deviation a deviation from the plan Modern examples of this type of weaving showed little deviation from traditional patterns.
- 2[countable] deviation (from something) (technology) the amount by which a single measurement is different from the average a compass deviation of 5° (= from true north) see standard deviation
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