| Quadratmillimeter | square millimeter square millimetre |
| Quadratkilometer | square kilometre |
| Quadratmikrometer | square micrometer square micrometre |
| Quadratzentimeter | square centimeter |
| Quadratdezimeter | square decimetre |
| Quadratmeter | square meter square metre |
| Quadrilliarde | octillion |
| Quadratmeile | square mile |
| quadrillionste | septillionth |
| Millimeter | millimeter millimetre |
| Quartiermeister | quartermaster |
| Quadrille | quadrille |
| Quadrillion | septillion |
| Quadrieren | quadrature |
| quadrieren | square |
| Quadriplegie | quadriplegia |
| Quadrocopter | quadcopter |
| Quadrokopter | quadcopter |
| Quadrupeder | quadruped |
| quantisieren | quantize |