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[dih-flek-shuh n] /dɪˈflɛk ʃən/
the act or state of deflecting or the state of being deflected.
amount of deviation.
the deviation of the indicator of an instrument from the position taken as zero.
Optics. deviation (def 5a).
Military. the angle formed by the line of sight to the target and the line of sight to the point at which a gun is aimed so as to strike the target.
Electronics. (in a cathode-ray tube) the bending by a magnetic field of the beam of electrons leaving the electron gun.
Also, British, deflexion.
Origin of deflection
1595-1605; < Late Latin dēflexiōn- (stem of dēflexiō), equivalent to Latin dēflex(us) (past participle of dēflectere; see deflect) + -iōn- -ion
Related forms
nondeflection, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for deflection
  • Good mindless deflection into some-diatribe-against-the-us.
  • But when it came to guarding his privacy, he was a master of deflection.
  • And besides, the principles of aerodynamics and radar-deflection know no political borders.
  • It takes a deflection on the way out, but a goal kick is awarded.
  • My question is totally relevant and your attempt at deflection proves you can't answer it.
  • The majority of collisions will result in this partial deflection instead of reflection.
  • High-quality rotor blade deflection data sets are relatively rare.
  • deflection values in this range typically correspond to pavements with high to medium levels of structural capacity.
  • This deflection also generates horizontal drag along the direction of the wind.
British Dictionary definitions for deflection


the act of deflecting or the state of being deflected
the amount of deviation
the change in direction of a light beam as it crosses a boundary between two media with different refractive indexes
a deviation of the indicator of a measuring instrument from its zero position
the movement of a structure or structural member when subjected to a load
Derived Forms
deflective, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for deflection

also (and with more etymological propriety) deflexion, c.1600, from Latin deflexionem, noun of action from past participle stem of deflectere (see deflect). Both forms were present 17c., but the spelling with -c- has come to predominate.

Online Etymology Dictionary, © 2010 Douglas Harper
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deflection in Medicine

deflection de·flec·tion (dĭ-flěk'shən)

  1. A turning aside or deviation.

  2. The deviation of an indicator in a measuring instrument, such as an electrocardiograph, from zero or from its normal position.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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