"relativity" in the noun sense
1. relativity, theory of relativity, relativity theory, Einstein's theory of relativity
physics) the theory that space and time are relative concepts rather than absolute concepts
the quality of being relative and having significance only in relation to something else
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License