Deflection

n. deviation, diversion, turning aside

Deflection or deflexion is a term used in physics, automotive, engineering, and weapon applications to describe four separate phenomena.
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Noun
1. a twist or aberration; especially a perverse or abnormal way of judging or acting
(synonym) warp
(hypernym) aberrance, aberrancy, aberration, deviance
2. the amount by which a propagating wave is bent
(synonym) deflexion, refraction
(hypernym) bending, bend
3. the movement of the pointer or pen of a measuring instrument from its zero position
(synonym) deflexion
(hypernym) movement, motion
4. the property of being bent or deflected
(synonym) deflexion, bending
(hypernym) physical property
(hyponym) windage, wind deflection
5. a turning aside (of your course or attention or concern); "a diversion from the main highway"; "a digression into irrelevant details"; "a deflection from his goal"
(synonym) diversion, deviation, digression, deflexion, divagation
(hypernym) turn, turning
(hyponym) red herring
(derivation) deflect, bend, turn away

n. diffraction, process of breaking up or bending waves (especially light or sound waves)

(n.)
The deviation of a shot or ball from its true course.
  

(n.)
The bending which a beam or girder undergoes from its own weight or by reason of a load.
  

(n.)
The act of turning aside, or state of being turned aside; a turning from a right line or proper course; a bending, esp. downward; deviation.
  

(n.)
A deviation of the rays of light toward the surface of an opaque body; inflection; diffraction.