| Relativitätstheorie | theory of relativity |
| Relativität | relativity |
| Staatstheorie | theory of the state |
| relative Adresse | relative address |
| Religionstheologie | theology |
| relativieren | qualify relativise relativize |
| Elastizitätsmodul | modulus of elasticity |
| realitätsfern | rarefied |
| Elektrizitätslehre | science of electricity |
| Bedienungstheorie | queue theory queueing theory |
| Erkenntnistheorie | epistemology |
| Evolutionstheorie | theory of evolution |
| Relativismus | relativism |
| relativ prim | relatively prime |
| spezielle Relativitätstheorie | special relativity |
| Spezielle Relativitätstheorie | special relativity special theory of relativity |
| Relativsatz | relative clause |
| Blattabtaster | scanner |
| Grammatiktheorie | grammar |
| Konspirationstheorie | conspiracy theory |