Definition of perturbation
1
: the action of perturbing : the state of being perturbed
2
: a disturbance of motion, course, arrangement, or state of equilibrium
especially
: a disturbance of the regular and usually elliptical course of motion of a celestial body that is produced by some force additional to that which causes its regular motion
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Merriam-Webster unabridged
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Time Traveler for perturbation
The first known use of perturbation was in the 14th century
See more words from the same century