Perturbation is a 12 letter word which starts with the letter P and ends with the letter N for which we found 2 definitions.
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(n.) The act of perturbing or the state of being perturbed; esp. agitation of mind. |
(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. |