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 Perturbation \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.
      [1913 Webster]

   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.
      [1913 Webster]