reflection >> rɪˈflɛkʃ(ə)n
Definition: [noun] the throwing back by a body or surface of light, heat, or sound without absorbing it.
Example: the reflection of light
Definition: [noun] serious thought or consideration.
Example: he doesn't get much time for reflection
Definition: [noun] the conceptual operation of inverting a system or event with respect to a plane, each element being transferred perpendicularly through the plane to a point the same distance the other side of it.