the quality of depending on something else for existence or of having its nature, quality, or value determined in relation to something, the absence of universal or absolute standards;
e.g. Photographs bring out the relativity in objects' appearances, since things are not always what they seem.
(noun)
(physics) a theory that describes the relationship between an observer and objects and phenomena around them in terms of time and space, with special attention the speeds of relative motion and light;
e.g. The theories of relativity can be used to describe various physical phenomena in the universe.