perturbationmedical dictionary

1. The act of perturbing, or the state of being perturbed; especially, agitation of mind.

2. <astronomy> 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.

Origin: L. Perturbatio: cf. F. Perturbation.

(01 Mar 1998)