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deflection. n. 1. the act of deflecting or the state of being deflected. 2. the amount of deviation. 3. (General Physics) the change in direction of a light beam as it crosses a boundary between two media with different refractive indexes.
In electronic versions of spring scales, the deflection of a beam supporting the unknown weight is measured using a strain gauge, which is a length-sensitive electrical resistance. The capacity of such devices is only limited by the resistance of the beam to deflection.