Definition of reflection are
1.
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.
2.
an image; representation; counterpart.
4.
a thought occurring in consideration or meditation.
5.
an unfavorable remark or observation.
6.
the casting of some imputation or reproach.
7.
Physics, Optics.
the return of light, heat, sound, etc., after striking a surface.
something so reflected, as heat or especially light.
8.
Mathematics.
(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.
9.
Anatomy. the bending or folding back of a part upon itself.