perturbation
noun C2- Agitation; the state of being perturbed.
- A small change in a physical system, or more broadly any definable system (such as a biological or economic system).
- Variation in an orbit due to the influence of external bodies.
Plural perturbations
From the library
Matthew was smoking--a sure sign of perturbation of mind.
Elizabeth, as they drove along, watched for the first appearance of Pemberley Woods with some perturbation; and when at length they turned in at the lodge, her spirits were in a high flutter.
While these newly-born notions were passing in their heads, the perturbation of Elizabeth’s feelings was every moment increasing.
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