Imperturbation :: Imperturbation (n.) Freedom from agitation of mind; calmness; quietude.

Perturbation :: Perturbation (n.) The act of perturbing, or the state of being perturbed; esp., agitation of mind..

Perturbation :: Perturbation (n.) 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..

Perturbational :: Perturbational (a.) Of or pertaining to perturbation, esp. to the perturbations of the planets..

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