the act of reflecting or the state of being reflected.
an image; representation; counterpart.
a fixing of the thoughts on something; careful consideration.
a thought occurring in consideration or meditation.
an unfavorable remark or observation.
the casting of some imputation or reproach.
Physics, Optics.
the return of light, heat, sound, etc., after striking a surface.
something so reflected, as heat or especially light.
(in a plane) the replacement of each point on one side of a line by the point symmetrically placed on the other side of the line.
(in space) the replacement of each point on one side of a plane by the symmetric point on the other side of the plane.
Anatomy. the bending or folding back of a part upon itself.
Also, especially British, reflexion.

1350–1400; Middle English < Late Latin reflexiōn- (stem of reflexiō) a bending back, equivalent to Latin reflex(us) (see reflex) + -iōn- -ion

reflectional, adjective
reflectionless, adjective
interreflection, noun
nonreflection, noun
overreflection, noun
self-reflection, noun
superreflection, noun

diffraction, diffusion, reflection, rarefaction, refraction.

3. meditation, rumination, deliberation, cogitation, study, thinking. 5. imputation, aspersion, reproach, criticism. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reflection or reflexion (rɪˈflɛkʃən)
1.  the act of reflecting or the state of being reflected
2.  something reflected or the image so produced, as by a mirror
3.  careful or long consideration or thought
4.  implicit or explicit attribution of discredit or blame
5.  maths a transformation in which the direction of one axis is reversed or which changes the sign of one of the variables
6.  anatomy the bending back of a structure or part upon itself
reflexion or reflexion
re'flectional or reflexion
re'flexional or reflexion

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., in reference to surfaces, from L.L. reflexionem (nom. reflexio) "a reflection," lit. "a bending back," from L. reflex-, pp. stem of reflectere, from re- "back" + flectere "to bend." Meaning "remark made after turning back one's thought on some subject" is from 1650s.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

reflection re·flec·tion (rĭ-flěk'shən)

  1. The act of reflecting or the state of being reflected.

  2. Something, such as light, radiant heat, sound, or an image, that is reflected.

  3. The folding of a membrane from the wall of a cavity over an organ and back to the wall.

  4. The folds so made.

  5. Mental concentration; careful consideration.

  6. A thought or an opinion resulting from such consideration.

re·flec'tion·al adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
reflection   (rĭ-flěk'shən)  Pronunciation Key 
  1. The change in direction of a wave, such as a light or sound wave, away from a boundary the wave encounters. Reflected waves remain in their original medium rather than entering the medium they encounter. ◇ According to the law of reflection, the angle of reflection of a reflected wave is equal to its angle of incidence. Compare refraction. See more at wave.

  2. Something, such as sound, light, or heat, that is reflected.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

reflection definition

A bouncing of light off a surface. People see themselves in mirrors through reflection. (Compare refraction.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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