perturbation

  1. Noun.  (uncountable) Agitation; the state of being perturbed.
  2. Noun.  (countable) A small change in a physical system, or more broadly any definable system (such as a biological or economic system).
  3. Noun.  (countable, astronomy) Variation in an orbit due to the influence of external bodies.

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This entry was last updated on RefTopia from its source on 3/20/2012.