(n) activity that is a malfunction, intrusion, or interruption, Syn.disturbance, Example: the term `distress' connotes some degree of perturbation and emotional upset; he looked around for the source of the disturbance; there was a disturbance of neural function
(n) an unhappy and worried mental state, Syn.upset, perturbation, Example: there was too much anger and disturbance; she didn't realize the upset she caused me
The Collaborative International Dictionary of English (GCIDE) v.0.53
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 ]
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