relativity/ˌreləˈtɪvətɪ; ˌrɛlə`tɪvətɪ/ n[U]1 state of being relative(1) 相对性.2 (physics 物) Einstein's theory of the universe, which shows that all motion is relative and treats time as a fourth dimension related to space 相对论.
牛津英汉双解词典