:::It's not a traditional proper noun, you're right, but it does satisfy all the conditions underlying why proper nouns are capitalized. It is a unique term-of-art, having a specific meaning other than the general meaning of the word. As used in physics, "Relativity" is different from the generic "relativity".--[[User:Aschlafly|Andy Schlafly]] 23:01, 29 July 2010 (EDT)
::::However, it is my belief, "relativity" in this case should not be treated differently. Look at the Wikipedia article, it uses "relativity" in that sense. Also, the [[theory of relativity|CP article on the subject]] uses the lowercase as well, so I still see no point in capitalizing it here. --[[User:GregoryZ|GregoryZ]] 23:07, 29 July 2010 (EDT)