Definitions for: Perturbation

[n] the act of causing disorder
[n] a disposition that is confused or nervous and upset
[n] activity that is an intrusion or interruption; "he looked around for the source of the disturbance"; "there was a disturbance of neural function"
[n] (physics) a secondary influence on a system that causes it to deviate slightly
[n] an unhappy and worried mental state; "there was too much anger and disturbance"; "she didn't realize the upset she caused me"

Webster (1913) Definition: Per`tur*ba"tion, n. [L. perturbatio: cf. F.
1. The act of perturbing, or the state of being perturbed;
esp., agitation of mind.

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.

Synonyms: disruption, disturbance, disturbance, fluster, upset

See Also: activity, agitation, bother, breakdown, discomposure, dislocation, disturbance, fuss, hassle, influence, magnetic storm, surprisal, surprise, trouble, variation

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