Word of the day

Perturbation – anxiety; mental uneasiness; mental disquiet, disturbance, or agitation; cause of mental disquiet, disturbance, or agitation; a change in the normal state or  regular movement of something;  deviation of a system, moving object, or process from its regular or normal state or path, caused by an outside influence; deviation of a celestial body from a regular orbit about its primary, caused by the presence of one or more other bodies that act upon the celestial body; a secondary influence on a system that modifies simple behaviour, such as the effect of the other electrons on one electron in an atom.

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