- 相对论性 xiāngduìlùnxìng relativisticrelativistic (physics)
- 广义相对论 guǎngyìxiāngduìlùn general relativityEinstein's theory of gravity, describing gravitation as a geometric property of spacetime
- 狭义相对论 xiáyìxiāngduìlùn special relativity
- 非相对论性 fēixiāngduìlùnxìng non-relativisticnon-relativistic (physics)