Per`tur*ba"tion(?), n. [L. perturbatio: cf. F. perturbation.] 1. The act of perturbing, or the state of being perturbed; esp., agitation of mind.
(Astron.) A disturbance in the regular elliptic or other motion of a heavenly body, produced by some force additional to that which causes its regular motion; as, the
perturbations of the planets are caused by their attraction on each other.
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Mon 17th June 2019