(n): the process of giving careful thought to something
(n): the phenomenon of a propagating wave (light or sound) being thrown back from a surface
(n): a natural phenomenon involving the physical properties of matter and energy
(n): expression without words
(n): a visual presentation showing how something works
(n): a likeness in which left and right are reversed
(n): similarity in appearance or character or nature between persons or things
(n): the image of something as reflected by a mirror (or other reflective material)
(n): a visual representation (of an object or scene or person or abstraction) produced on a surface
(n): (mathematics) a transformation in which the direction of one axis is reversed
(n): (mathematics) a function that changes the position or direction of the axes of a coordinate system
(n): a remark expressing careful consideration
(n): a statement that expresses a personal opinion or belief or adds information
(n): the ability to reflect beams or rays
(n): any property used to characterize matter and energy and their interactions
