(physics) the theory that space and time are relative concepts rather than absolute concepts
"Einstein's theory of relativity revealed that measurements of distance and duration change depending on an observer's speed, proving that neither space nor time is fixed."
the quality of being relative and having significance only in relation to something else
"The success of his startup is entirely a matter of relativity, depending heavily on how it compares to competitors rather than its absolute performance."
The state of being relative to something else; the absence of universally applicable rules or standards; relativism; (countable) an instance of this.
"The debate over moral relativity left our committee unable to agree on a single standard for evaluating the candidates' actions."