principle of relativity

Noun

 * 1)  The principle that only the motion of objects relative to one another can be measured, and that there is no absolute frame of reference.

Translations

 * Chinese:
 * Mandarin: 相對性原理
 * Danish:
 * Finnish: suhteellisuusperiaate
 * Galician: principio da relatividade
 * Georgian: ფარდობითობის პრინციპი
 * Portuguese:
 * Spanish: