Relativity (noun)

1. The state of being relative to something else, the concept that the properties of objects are relative to the observer's frame of reference.
2. The theory of relativity, a set of theories of physics developed by Albert Einstein, which describes the laws of motion and the nature of space and time.

Origin:

From the latin relativus, from relatus meaning "carried back".

Examples:

1. The theory of relativity revolutionized our understanding of the universe.
2. The concept of relativity is important in physics, but it is also used in other fields such as psychology and sociology.
3. Relativity states that the laws of physics are the same for all observers in uniform motion.
4. The principle of relativity states that the laws of physics should be the same for all observers.
5. The theory of relativity has been verified in many experiments.