PERTURBATION

perturbation. perturbation, disquietnes, or trouble

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perturbation. Perturbation, n. disquiet, disorder, confusion

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Per′tur‐ba″tion (?), n. [[L. perturbatio: cf. F. perturbation.]] 1. 1. The act of perturbing, or the state of being perturbed; esp., agitation of mind.
2. 2. (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. Newcomb.