perturbation definition, perturbation meaning | English dictionary

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1    the act of perturbing or the state of being perturbed  
2    a cause of disturbance or upset  
3      (Physics)   a secondary influence on a system that modifies simple behaviour, such as the effect of the other electrons on one electron in an atom  
4      (Astronomy)   a small continuous deviation in the inclination and eccentricity of the orbit of a planet or comet, due to the attraction of neighbouring planets  
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