Definition of "general relativity" []

• The geometric theory of gravitation developed by Albert Einstein, incorporating and extending the theory of special relativity to accelerated frames of reference and introducing the principle that gravitational and inertial forces are equivalent. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Building on the concept of the quanta, in 1923, almost a decade after Einstein published his general relativity theory no longer a theory; now it is a law, the French physicist Louis de Broglie introduced an idea that was even more bizarre in its assertions than Einstein’s claim that matter really was a form of energy."