the act of reflecting, as in casting back a light or heat, mirroring, or giving back or showing an image; the state of being reflected in this way.
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.
the act of reflecting or the state of being reflected
something reflected or the image so produced, as by a mirror
careful or long consideration or thought
implicit or explicit attribution of discredit or blame
(maths) a transformation in which the direction of one axis is reversed or which changes the sign of one of the variables
(anatomy) the bending back of a structure or part upon itself

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

The act of reflecting or the state of being reflected.

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

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

The folds so made.

Mental concentration; careful consideration.

A thought or an opinion resulting from such consideration.

re·flec’tion·al adj.

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.

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

reflection definition

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


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