Word forms: plural deflections1. variable nounThe deflection of something means making it change direction.
[technical] ...the deflection of light as it passes through the slits in the grating.
Synonyms: deviation, bending, veering, swerving More Synonyms of deflection
2. countable nounIn sport, the deflection of a ball, kick, or shot is when the ball hits an object and then travels in a different direction.