from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of, pertaining to, or caused by perturbation
from the GNU version of the Collaborative International Dictionary of English
- adj. Of or pertaining to perturbation, esp. to the perturbations of the planets.
from The Century Dictionary and Cyclopedia
- Of or pertaining to perturbation or disturbance: as, the perturbational theory.
Sorry, no etymologies found.
This was not only an entirely new approach to the then unsolved problem of simply describing the motion of the Moon, an approach that proceeded from the physical cause to the motion; it was also the beginnings of the perturbational approach that dominated all of celestial mechanics from the middle of the eighteenth century until late in the twentieth. [