Relationship to other objects or systems; specif., the theory of the relative, rather than absolute, character of motion, velocity, mass, etc. and the interdependence of matter, time, and space, as developed and mathematically formulated by Einstein.

【理】一物与他物之关系；(特指爱因斯坦的)相对论。

State of being relative.

相关[相对]性。

Interdependence on one another.

相互依赖的关系。