Pĕr'tur-bā'tion, n.
[Lat. perturbatio, Fr. perturbation, Pr. perturbacio, Sp. perturbacion, It. perturbazione.]
Sense 1. The act of perturbing, or the state of being perturbed.
Sense 2. (Astron.) An irregularity in the motion of a heavenly body through its orbit.