Noun
The act of perturbing, or the state of being perturbed; esp., agitation of mind.
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.
Source: Webster's dictionarythe term `distress' connotes some degree of perturbation and emotional upset Source: Internet
he looked around for the source of the disturbance Source: Internet
there was a disturbance of neural function Source: Internet
there was too much anger and disturbance Source: Internet
she didn't realize the upset she caused me Source: Internet
A general density perturbation is a mixture of both, and different theories that purport to explain the primordial density perturbation spectrum predict different mixtures. Source: Internet