Synonyms of 'deflection'
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the angular distance, esp in degrees, of a star, planet, etc, from the celestial equator measured north (positive) or south (negative) along the great circle passing through the celestial poles and the body
Deviation means doing something that is different from what people consider to be normal or acceptable.
Deviation from the norm is not tolerated.
Thesaurus for deflection from the Collins English Thesaurus
The deflection of something means making it change direction.