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What does perturbation mean?

Looking for the meaning or definition of the word perturbation? Here's what it means.

Noun
  1. (uncountable) Agitation; the state of being perturbed
  2. (countable) A small change in a physical system, or more broadly any definable system (such as a biological or economic system)
  3. (astronomy) Variation in an orbit due to the influence of external bodies
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Examples
In cold advection the cyclonically rotating ascent to the right is opposed by decent forced by the linear pressure perturbation.
The British and American governments accepted the rejection of treaty revision without too much perturbation.
All of these can be shown by hematologic abnormalities or hepatomegaly with liver test perturbation.
Sometimes a small perturbation of a system could cause it to switch from one pattern to another.
The perturbation theory given here is adequate to show how the two atoms can form a diatomic molecule through the covalent bonding mechanism.
The consensus model presented here is derived from the results of analyzing only six traces recorded in response to a single perturbation.

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