De*flec"tion (?), n. [L. deflexio, fr. deflectere: cf. F. déflexion.] 1. 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.

The other leads to the same point, through certain deflections.

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

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

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

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