n.[U]

1. 相关性；相互依存
2. 相对性
   They teach the relativity of all ethical ideas.

   他们宣扬一切道德观念的相对性。

3. 【物】相对论
4. 【哲】相对主义；认识的相对性

n.

1. the absence of standards of absolute and universal application.
2. Physics  a description of matter, energy, space, and time according to Einstein's theories based on the importance of relative motion and the principle that the speed of light is constant for all observers.