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Noun: relativity  `relu'tivitee
  1. (physics) the theory that space and time are relative concepts rather than absolute concepts
    - theory of relativity, relativity theory, Einstein's theory of relativity
     
  2. The quality of being relative and having significance only in relation to something else

Derived forms: relativities

See also: relative, relativistic

Type of: quality, scientific theory

Encyclopedia: Relativity