a perturbing or being perturbed
something that perturbs; disturbance
a small change in an orbit caused by the attraction of another celestial
body, other bodies, etc.
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
Houghton Mifflin Harcourt. All rights reserved.
Derived forms perturbational (ˌperturˈbational)
adjective or ˈperturˌbative
Word origin of 'perturbation'ME < MFr perturbacion < L perturbatio