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Noun: perturbation  ,pur-tu(r)'bey-shun
  1. An unhappy and worried mental state
    "there was too much anger and perturbation";
    - disturbance, upset
  2. (physics) a secondary influence on a system that causes it to deviate slightly
  3. Activity that is a malfunction, intrusion, or interruption
    "the term 'distress' connotes some degree of perturbation and emotional upset";
    - disturbance
  4. A disposition that is confused or nervous and upset
    - fluster
  5. The act of causing disorder
    - disruption

Derived forms: perturbations

Type of: activity, agitation, discomposure, disturbance, influence

Encyclopedia: Perturbation